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Table of Contents

Call Control

Call Control

The MGX 8260 Media Gateway works in conjunction with Media Gateway Controller (MGC) servers and the Public Switched Telephone Network (PSTN) to control voice and data calls.

Primary Call Control Components

The following components of the call control system are most important:

STPs are components in the Signalling System 7 (SS7) network that route management traffic between Service Switching Points (SSPs) and Service Control Points (SCPs).

The CO provides telephony services to subscribers and handles the associated management traffic. The CO is often a SSP in the SS7 network.

An MGC, such as the VSC2700 Media Gateway Controller, communicates with the SS7 network and MGX 8260 Media Gateways to process multimedia calls. These communications links can use backhaul channels to adapt PSTN signaling to IP/ATM signaling.

The MGX 8260 Media Gateway switches voice and data traffic between PSTN circuits and a packet backbone, and it works with PSTN signaling points for voice call control and with MGCs for multimedia call control. In addition, the MGX 8260 Media Gateway adapts PSTN signaling to IP/ATM signaling so the MGC can control PSTN calls directly.

Primary MGX 8260 Call Control Interfaces

The MGX 8260 Media Gateway communicates with other media and signaling equipment through the following interfaces:

The MGX 8260 Media Gateway communicates with PSTN equipment using an ISDN (Integrated Services Digital Network) D Channel of a Primary Rate Interface ISDN trunk. Within the D Channel, multiple logical links may exist, which are defined by DLSAP and MACSAP profiles.

The MGX 8260 Media Gateway exchanges switching information with MGCs using either MGCP or IPDC over an IP network. The protocol choice depends on the specific network. The physical transport is Ethernet at the MGX 8260 interface.

The MGX 8260 Media Gateway exchanges switching information with MGCs using either MGCP or IPDC over an IP network. The protocol choice depends on the specific network. The physical transport is Ethernet at the MGX 8260 interface.

The MGX 8260 Media Gateway tunnels ISDN Layer 3 (Q.931) messages through the IP network to and from each MGC. At the ISDN interface, the MGX 8260 Media Gateway implements ISDN Layer 2 (Q.921).

Understanding MGCP

This section describes how to configure and view MGCP (Media Gateway Control Protocol). The MGX 8260 Media Gateway implements the standard MGCP protocol stack (see Figure 5-1).


Figure 5-1: MGCP Protocol Stack


The protocol stack contains the following layers:

The following diagram shows how to configure MGCP IP addresses in a fully-redundant system (see Figure 5-2).


Figure 5-2: MGCP Addresses and Ports


The minimal system consists of a primary MGC network, the MGX 8260 Media Gateway, and an IP network. You can add the secondary network and secondary MGC for more reliable operation.

Configuration Tasks for MGCP

To configure MGCP, you perform the following tasks:

Switching from IPDC to MGCP

The MGX 8260 Media Gateway supports two call control protocols, MGCP and IPDC. By default, MGCP is enabled and IPDC is disabled. This procedure explains how to switch back to MGCP from IPDC.

Warning Switching protocols interrupts service. Perform this operation during light traffic periods or in a pre-arranged maintenance window.

To switch protocols, follow these steps:

Step 1   Change the protocol type using the chprotocol command, specifying 1 for MGCP; then confirm your action. The system automatically reboots.

Step 2   After the chassis restarts, log in again.

Step 3   Verify the change using the lsndinf command.

Configuring MGCP IP Addresses

Before beginning this procedure, obtain the IP addresses and ports that apply to your system. Make sure your IP and port selections do not conflict with other equipment on the networks.

Step 1   Set the local address and ports on network 1 using the chmgcplocaladdr1 command as described in the "chmgcplocaladdr1" section.

Step 2   If your system uses network redundancy, set the local address and ports for network 2 using the chmgcplocaladdr2 command.

Step 3   Set the primary media controller addresses and ports using the chpmgcpaddr command.

Step 4   If your system includes a redundant MGC, set the secondary media controller addresses and ports using the chsmgcpaddr command.

Step 5   Define the MGCP domain name using the chmgcpdname.

Step 6   Check your configuration using the lsmgcpdef command.

Configuring MGCP Core Parameters

MGCP core settings enable and disable the protocol and control how it works.

To configure MGCP core parameters, follow these steps:

Step 1   Specify the desired parameters using the chmgcpcore command.

Step 2   Confirm the changes using the lsmgcp command.

Configuring MGCP Default Call Setup Parameters

Call setup parameters define the default characteristics of a new call.

To configure default call setup parameters, follow these steps:

Step 1   Specify the default call setup parameters using the chmpc command.

Step 2   Confirm the changes using the lsmpc command.

Viewing MGCP Settings

You can view the following MGCP information:

To view MGCP IP settings, use the lsmgcpdef command.

The following information is displayed:

========================================================================= Primary MGCP Address 1 : 10.15.26.1 Primary MGCP UDP Port 1 : 2427 Primary MGCP Address 2 : 10.15.27.1 Primary MGCP UDP Port 2 : 2427 Secondary MGCP Address 1 : 10.15.26.2 Secondary MGCP UDP Port 1 : 2427 Secondary MGCP Address 2 : 10.15.27.2 Secondary MGCP UDP Port 2 : 2427 Connection Status : unknown Time at which Connection Status changed : 02/12/2000 17:57:59 Local Address 1 : 10.15.26.20 Local Primary Port 1 : 2427 Local Address 2 : 10.15.27.20 Local Primary Port 2 : 2427 MGCP domain name : mgx8260

Displayed Information Description

Primary MGCP Address 1

The IP address of the Primary Media Gateway Controller on network 1. Specify the IP address in standard dot notation.

Primary MGCP UDP Port 1

The UDP port of the Primary Media Gateway Controller on network 1.

Primary MGCP Address 2

The IP address of the Primary Media Gateway Controller on network 2. Specify the IP address in standard dot notation.

Primary MGCP UDP Port 2

The UDP port of the Primary Media Gateway Controller on network 2.

Secondary MGCP Address 1

The IP address of the Secondary Media Gateway Controller on network 1.

Secondary MGCP UDP Port 1

The UDP port of the Secondary Media Gateway Controller on network 1.

Secondary MGCP Address 2

The IP address of the Secondary Media Gateway Controller on network 2.

Secondary MGCP UDP Port 2

The UDP port of the Secondary Media Gateway Controller on network 2.

Connection Status

The current status of the MGCP connection, as follows:

  • unknown—undefined status

  • connected—message is sent and response to it is received

  • connecting—message is sent and waiting for response

  • noSuchName—no domain name/IP address is found

  • noResponse—timeout on message

Timestamp

The time when the Connection Status last changed.

Local Address 1

The IP address of the MGX 8260 interface for network 1. This address is on the same subnet as the Primary MGCP IP Address.

Local Primary Port 1

The primary UDP port of the MGX 8260 interface for network 1.

Local Address 2

The IP address of the MGX 8260 interface for network 2. This address is on the same subnet as the Primary MGCP IP Address.

Local Primary Port 2

The primary UDP port of the MGX 8260 interface for network 2.

Viewing MGCP Voice Parameters

The MGX 8260 Media Gateway uses threshold levels to determine when to send alerts to the MGC. This command lists the current settings.

To view MGCP voice parameters, use the lsmgcpvoice command.

============================================================= MGCP Voice parameters ============================================================= Lower Bound for Packet Loss : Higher Bound for Packet Loss : Lower Bound for Jitter : Higher Bound for Jitter : Lower Bound for Latency : Higher Bound for Latency :

Displayed Information Description

Lower Bound for Packet Loss

The packet loss level that enables an alert.

Higher Bound for Packet Loss

The packet loss level that triggers an alert message. Once triggered, alert messages are disabled until the level drops below the lower bound.

Lower Bound for Jitter

The jitter level that enables an alert.

Higher Bound for Jitter

The jitter level that triggers an alert message. Once triggered, alert messages are disabled until the level drops below the lower bound.

Lower Bound for Latency

The latency level that enables an alert.

Higher Bound for Latency

The latency level that triggers an alert message. Once triggered, alert messages are disabled until the level drops below the lower bound.

Viewing Default Call Setup Parameters

To view call control parameters, use the lsmpc command. The system displays the following information:

========================================================================= MPC Parameters (lsmpc) ========================================================================= Default Type of Network : voIp Packetization Period : 10 Bandwidth : 64 Echo Cancellation : off Silence Suppression : off Type of Service : 2 Resource Reservation : bestEffort Default COT Receive Tone : co2 Default COT Transmit Tone : co1 Default Encoding Type : g729a

Displayed Information Description

Default Type of Network

The type of network, voice-over-IP, voice-over-ATM, or local

Packetization Period

Packetization Period in milliseconds. Value: fixed at 10

Bandwidth

The network bandwidth in kbps. Values: 8 and 64 kbps

Echo Cancellation

Enables or disables echo cancellation.

Silence Suppression

Enables or disables silence suppression.

Type of Service

The type of Service. Values: 1-256, where 1 indicates no service type

Resource Reservation

The resource reservation type. Values:

  • bestEffort

  • guaranteed

  • notUsed

  • controlledLoad

Default COT Receive Tone

The default receive tone. For transponder COT, when the media gateway controller does not supply the tones, the default tone the gateway receives is the default COT receive tone. Values:

  • co1

  • co2

Default COT Transmit Tone

The default transmit tone. For transponder COT, when the media gateway controller does not supply the tones, the default tone the gateway transmits is the default COT transmit tone. Values:

  • co1

  • co2

Default Encoding Type

The type of voice encoding when not specified by the MGC:

  • PCMU—Mu -law encoding

  • PCMA—A-law encoding

  • G729A

  • G726_32K

Viewing MGCP Status Information

To view MGCP status, use the lsmgcp command. The system displays the following MGCP status information:

========================================================================= Incoming messages with bad protocol version : 0 Request Timeout : 5000 Request Retries : 12 Operational Status : down Unrecognized Packets : 0 Maximum waiting delay for restart (millisecs) : 4000 Restart Delay (seconds) : -1 Connectivity Timeout (millisecs) : 60000 Response Timeout (millisecs) : 1000 Capabilities Package Name : Generic; Trunk; Line; RTP

Displayed Information Description

Incoming messages with bad protocol version

The total number of incoming messages delivered to the protocol entity that were for an unsupported protocol version.

Request Timeout

The time in milliseconds before retransmitting an unacknowledged message.

Request Retries

The maximum number of retries for a request that times out.

Operational Status

The administrative state, as follows:

  • up—MGCP is up and running

  • bringUpInProgress—MGCP is coming up

  • shutDownInProgress—MGCP is shutting down

  • down—MGCP is administratively down

Unrecognized Packets

The number of unrecognized packets since the MGX 8260 Media Gateway was reset.

Maximum waiting delay for restart

The maximum waiting delay, in milliseconds, before the Media Gateway interface sends the Restart In Progress message to the Media Gateway Controller

Restart Delay

The delay for a graceful shutdown.

Connectivity Timeout

The time in milliseconds to wait for a request from MGCP before dropping the link.

Response Timeout

The time in milliseconds to wait before retransmitting unacknowledged messages.

Capabilities Package Name

A list of the capabilities packages:

  • Generic

  • DTMF

  • MF

  • Trunk

  • Line

  • Handset

  • RTP

  • Network Access

  • Announcement

  • Script

Viewing MGCP Protocol Statistics

To view MGCP statistics, use the lsmgcpstat command. The system displays the following statistical information:

============================================================= Total decode errors : 0 Total encode errors : 0 Total Drop On Receive errors : 0 Total Request Transmissions : 108 Total Response Transmissions : 0 Provisional Responses : 0

The MGCP protocol collects these statistics continuously after the SCC powers up or resets; you can't reset these counters. This display is a troubleshooting tool for use by experienced technicians who understand the protocol.

Understanding Sessions

The session manager organizes individual sessions into groups and sets (see Figure 5-3).


Figure 5-3: Organization of Sessions


The backhaul sessions and groups include the following components:

When adding sessions, you create a structure that supports reliable operation. The goal for a fully-redundant system is to provide multiple management sessions to multiple MGCs via multiple physical networks (see Figure 5-4).


Figure 5-4: Logical Session Model


With full redundancy, you configure the following:

This assumes that every transport address has corresponding IP interface address and a UDP port unique for that IP address.

If the MGC can't handle all D Channels in one session set, you configure another similar set using different UDP ports and D Channels.

Configuration Tasks for Sessions

To configure ISDN backhaul signaling, perform the following tasks:

Step 1   Add session sets

Step 2   Add session groups

Step 3   Add session managers

Configuring Session Sets

You can view and change session sets.

Viewing Session Set Information

To view set details, use the lsset command. The following example lists information about session set 1.

lsset 1

The system displays the following session set information:

======================================================================= Session Set (lsset) ======================================================================= Set Identifier : 1 Set State : outOfService Total Groups : 1 Active Group : -1 Minimum Slot Number : 11 Maximum Slot Number : 11 Minimum Line Number : 1 Maximum Line Number : 20 Redundancy Mode : nonFaultTolerant SwitchOver Failures : 0 Successful Switchovers : 0 Down Count : 0

Displayed Information Description

Set Identifier

The identification number for the set. Use this number when requesting set details

Set State

The group state:

  • notCreated

  • outOfService

  • standby

  • active

  • full

  • switchOver

Total Groups

The total number of groups in the set

Active Group

The group within the set that is active

Minimum Slot Number

The minimum slot number this set controls

Maximum Slot Number

The maximum slot number this set controls

Minimum Line Number

The minimum line number this set controls

Maximum Line Number

The maximum line number this set controls

Redundancy Mode

The type of fault tolerance for the set

SwitchOver Failures

The number of unsuccessful switchovers from one session to another

Successful Switchovers

The number of successful switchovers from one session to another

To view all sets, use the lssets command. The system displays the following summary information:

=========================================================================== Session Sets (lssets) =========================================================================== Set Id Set State Total Groups Active Group ======== ============ ============ =============== 1 outOfService 1 -1

See the description of displayed information for the lsset command.

Adding a Session Set

Session sets contain a collection of session groups and managers that control a range of MGX 8260 lines. One or two session sets are adequate for a single MGX 8260 chassis.

To add a session set, use the addsset command.

For example, the following command adds session set 1 for lines 1-168 of the BSC in slot 11:

addsset 1 11 1 11 168 1

Deleting a Session

To delete a session set, use the delsset command. For example, the following command deletes session set 1:

delsset 1

Configuring Session Groups

You can view and change session groups.

Viewing Session Groups

To view group details, use the lsgroup command. For example, the following command lists information for session 1 of group 1.

lsgroup 1 1

The system displays the following group information:

======================================================================= Session Group (lsgroup) ======================================================================= Set Identifier : 1 Group Identifier : 1 Group State : outOfService Group Use State : none Group Active Session : -1 Group Previous Session : -1 Total Sessions : 1 Total Active Sessions : 0

Displayed Information Description

Set identifier

The set to which this group belongs

Group Identifier

The identification number for the group

Group State

The group state:

  • outOfService

  • inService

  • notCreated

Group Use State

The session use state: active standby none

Group Active Session

The session within this group that is active

Group Previous Session

The previously-active session within this group

Total Sessions

The total number of sessions for this group

Total Active Sessions

The total number of active sessions for this group

To view all groups, use the lsgroups command. The system displays the following group information:

=========================================================================== Session Groups (lsgroups) =========================================================================== Group Id Set ID Use State Active Session Group State ======== ========== ============= =============== =============== 1 1 none -1 outOfService

See the description of displayed information for the lsgroup command.

Adding a Session Group

MGCP session groups organize sessions into logical groups. A session group contains a collection of sessions that communicate with the same MGC.

To add a session group, use the addsgrp command.

For example, the following command adds session group 1 to session set 1:

addsgrp 1 1

Deleting a Session Group

To delete a session group, use the delsgrp command.

For example, the following command deletes session group 1 from session set 1:

delsgrp 1 1

Configuring Sessions

You can view and change sessions.

Viewing Session Information

To view session details, use the lssession command. The following example lists information about session 1 of group 1 in set 1.

lssession 1 1 1

The system displays the following session information:

======================================================================= Session Entry (lssession) ======================================================================= Session Identifier : 1 Group Id : 1 Session Set Id : 1 Session State : openWait Use State : outOfService Priority : 1 Local Port : 7007 Local Address : 10.15.38.233 Remote Port : 7007 Remote Address : 10.15.38.234

Displayed Information Description

Session Identifier

The identification number for this session

Group Id

The identification number for the group to which this session belongs

Session Set ID

The identification number for the session set to which this session belongs

Session State

The session state:

  • notCreated

  • open

  • openWait

  • openXfer

  • close

  • closeWait

  • userClose

  • autoReset

Use State

The session use state:

  • outOfService

  • inService

  • blocked

Priority

The priority level of this session

Local Port

The local UDP port number for this session

Local Address

The local IP address for this session

Remote Port

The remote port of a MGC for this session

Remote Address

The remote IP address for this session

To view all sessions, use the lssessions command. The system displays the following summary information:

=========================================================================== Sessions (lssessions) =========================================================================== Set Id Group Id Session Id Session State Use State ====== ======== ========== ============= ========== 1 1 1 openWait outOfService

See the description of displayed information for the lssession command.

Adding a Session

Sessions are members of session groups, which in turn, are members of session sets. To ensure reliable operation, set up two sessions to each controller through two subnets.

To add a session, use the addsess command.

For example, the following command adds session 1 to group 1 of set 1:

addsess 1 1 1 10.15.38.233 7007 10.15.38.234 7007

Deleting a Session

To delete a session, use the delsess command.

For example, the following command deletes session 1 from session group 1 of set 1:

delsess 1 1 1

Viewing Session Statistics

The MGX 8260 reports the following session statistics:

Viewing Session Group Statistics

To view session group statistics, use the lsgroupstat command.

For example, the following command lists statistics for group 1 of set 1:

lsgroupstat 1 1

The system displays the group statistics:

======================================================================= Session Group Statistics (lsgroupstat) ======================================================================= Set Identifier : 1 Group Identifier : 1 Session Failures : 0 Session Failover Success : 0 Active Packets Received : 0 Standby Packets Received : 0 Total PDU Post Errors : 0

Viewing RUDP Connection Statistics

To view RUDP connection statistics, use the lsrudpconnstats command.

For example, the following command lists statistics for session 1 of group 1 in set 1:

lsrudpconnstats 1 1 1

The system displays the statistics:

======================================================================= RUDP statistics for a connection (lsrudpconnstats) ======================================================================= Set Index : 1 Group Index : 1 Session Index : 1 State of the Connection : synSent Number of auto resets : 0 Number of auto resets received : 0 Number of packets received in Sequence : 0 Number of packets received out of Sequence: 0 Number of packets sent : 4 Number of packets Received : 0 Number of data packets sent : 0 Number of data packets received : 0 Number of packets discarded : 0 Number of packets retransmitted : 0

Viewing RUDP Transport Statistics

To view RUDP transport statistics, use the lsrudptxstats command.

For example, the following command lists statistics for session 1 of group 1 in set 1:

lsrudptxstats 1 1 1

The system displays the statistics:

======================================================================= RUDP Transport Statistics (lsrudptxstats) ======================================================================= Session Identifier : 1 Group Id : 1 Session Set Id : 1 RUDP Connections Opens : 0 RUDP Connection Resets : 978 RUDP Connection Refused : 0 RUDP Connection Failed : 0 RUDP Auto Resets : 0 RUDP Open Failed : 0 RUDP Not Ready : 0 RUDP Connection Not Open : 0 RUDP Transmit Window Full : 0 RUDP Transmit Fail-No resources: 0 RUDP Transmit Fail-Enque failed: 0

Viewing Session Statistics

To view session statistics, use the lssessstats command.

For example, the following command lists statistics for session 1 of group 1 in set 1:

lssessstats 1 1 1

The system displays the statistics:

======================================================================= Session Statistics (lssessstats) ======================================================================= Session Identifier : 1 Group Id : 1 Session Set Id : 1 Session Resets : 0 Session Opens : 0 Session CloseWaits : 0 Session Closes : 2144 Session UnExpected Transitions : 0 Session Total Packets Received : 0 Session Receive Errors : 0 Session Total Packets Sent : 0 Session PDU Transmission Fails : 0 Session PDU Blocked : 0 Session NonPDU Fails : 0 Session NonPDU Blocked : 0

To view session statistics since the last reset, use the lssessstatslr command.

Managing ISDN D Channels

The MGX 8260 Media Gateway extends Primary Rate Interface ISDN D Channel signaling to a Media Gateway Controller via a backhaul channel (see Figure 5-5).


Figure 5-5: D Channel to Media Gateway Controller


Each BSC contains 168 T1 lines, each a potential Primary Rate ISDN line. An ISDN line contains 24 channels, one of which is the D Channel that carries the signaling information for the other 23 channels. The BSC card can terminate a D Channel signaling stack and pass the payload to a Media Gateway Controller, via the SCC, using a backhaul session.

The following procedures describe how to configure a D Channel for a backhaul session. The procedures assume you already have a DS3 line and have provisioned a PRI ISDN line on one of its circuits. ISDN D Channels can be difficult to configure because they have many settings, so the MGX 8260 Media Gateway simplifies the process by grouping common settings into two types of profiles:

The Digital Link Service Access Profile (DLSAP) and Media Access Control Service Access Profile (MACSAP) profiles define different levels of the ISDN protocol stack (see Figure 5-6).


Figure 5-6: DLSAP and MACSAP Interfaces


When adding D Channels, you simply specify suitable profiles that contain the desired configuration set. You can create profiles using default settings that accommodate the signaling requirements for common applications.

D Channel Configuration Tasks

The MGX 8260 Media Gateway simplifies the process of creating D Channels with DLSAP and MACSAP profiles. These profiles provide a template of parameter settings that you apply when adding D Channels. Changes you make to the profiles only apply to lines you subsequently add, not to lines that already exist. If you want to change the configuration of a D Channel, delete it first and then recreate a new one using the new template.

The following describes the high-level procedure for configuring a D Channel on an existing DS3 trunk:

Step 1   Define a DLSAP profile.

Step 2   Define a MACSAP profile.

Step 3   Define a D Channel on a PRI ISDN line within the DS3 trunk, using the profiles you defined in
Steps 1 and 2.

The following sections present detailed procedures for each of these steps. For more information on configuring backhaul, see the "Understanding Sessions" section.

Managing MACSAP Profiles

MACSAP management consists of adding and deleting profiles. You need at least one profile to add D Channels.

Adding MACSAP Profiles

To add a MACSAP profile, follow these steps:

Step 1   Specify a MACSAP profile using the addmacsapprof command. For example, The following command adds MACSAP profile 1 with default settings:

addmacsapprof 1

Step 2   Check the profile settings using the lsmacsapprof command.

Deleting MACSAP Profiles

To delete a MACSAP profile, use the delmacsapprof command. The following example deletes profile 1.

delmacsapprof 1

Use lsmacsapprofs to discover valid profile numbers.

Viewing MACSAP Profiles

To view a MACSAP profile, use the lsmacsapprof command. The following example displays information about MAC SAP 1.

lsmacsapprof 1

The system displays a single MACSAP profile:

======================================================================= MACSAP Profile (lsmacsapprof) ======================================================================= MACSAP Identifier : 1 MAC SAP Interface : network Link Setup Arbitration : passive LAPD Type : ccitt Maximum Outstanding Frames : 7 Timer Queue Upper Threshold : 1000 Timer Queue Lower Threshold : 100 Connection Timer : 500 T201 Timer : 1 T202 Timer : 2 TEI Check Timer : 5 N202 : 3 Lowest Range of Automatic TEI: 64 Keep MAC Up All The Time : true

See the description of displayed information in the "Viewing D Channels" section.

To view all MACSAP profiles, use the lsmacsapprofs command. The system displays MACSAP profile summaries:

======================================================================= MACSAP Profiles (lsmacsapprofs) ======================================================================= MACSAP Interface Arbitration LAPD Type N202 ========= =========== ============= ============= ========== 1 network passive ccitt 3

See the description of displayed information in Deleting D Channels for a description of this information.

Viewing MACSAP Statistics

To view MACSAP statistics for a line, use the lsmacsapstat command. The following example displays statistics for the MACSAP at slot 7, line 3.

lsmacsapstat 14.1

The system displays MACSAP statistics for the specified line:

======================================================================= Statistics for a MACSAP (lsmacsapstat) ======================================================================= MACSAP : 14.1 MACSAP Status : inUse Received Frames : 0 Transmitted Frames : 0 Received Bytes : 0 Transmitted Bytes : 0 Receive Queued Count : 0 Transmit Queued Count : 0 Receive Dropped Count : 0 Transmit Failed Count : 0

To view all MACSAP statistics, use the lsmacsapstats command. The system displays MACSAP statistic summaries:

======================================================================= MACSAP Statistics (lsmacsapstats) ======================================================================= Slot.Line Received Frames Transmitted Frames Received Bytes ========= =============== ================== ============== 14.1 0 0 0

Managing DLSAP Profiles

DLSAP management consists of adding and deleting profiles. You need at least one profile to add D Channels.

Adding DLSAP Profiles

To add a DLSAP profile, follow these steps:

Step 1   Specify the settings that define a DLSAP profile using the adddlsp command as described in the "adddlsp" section. For example, the following command adds DLSAP profile 1 with default settings:

adddlsp 1

Step 2   Check the profile settings using the lsdlsp command.

Deleting DLSAP Profiles

To delete a DLSAP profile, use the deldlsp command, specifying the identifier of the DLSAP profile to delete. The following example deletes profile 9.

deldlsp 9

Viewing DLSAP Profiles

To view a DLSAP profile, use the lsdlsp command. The following example lists DLSAP profile 1.

lsdlsp 1

The system displays the specified DLSAP profile:

======================================================================= DLSAP Entry (lsdlsp) ======================================================================= DLSAP Profile Id : 1 Frame Length : 1960 Window Size : 7 Retransmission Count : 3 Congestion Timer : 200 t200 Timer : 1 t203 Timer : 10 Modulo : 128 TEI Assignment : 1 Maximum DLCs for this DLSAP : 1 TEI : 2

See the description of displayed information in Viewing D Channels.

To view all DLSAP profiles, use the lsdlsps command. The system displays DLSAP profile summaries:

======================================================================= DLSAP Profiles (lsdlsps) ======================================================================= Profile# Frame Len Window Size Retrans Count Modulo ========= =========== ============= ============= ========== 1 1960 7 3 128

For more information, see the description of displayed information in the "Viewing D Channels" section.

Viewing DLSAP Status

To view DLSAP status for a line, use the lsdlsapstatus command, specifying the slot and line number delimited by a period. The following example shows how to get the status of a DLSAP in slot 14, line 1.

lsdlsapstatus 14.1

The system displays DLSAP the status for the specified line:

======================================================================= Status for a DLSAP (lsdlsapstatus) ======================================================================= DLSAP : 14.1 Number of Outstanding Frames : 0 Number of Frames Dropped by MAC : 0 Local Busy Status : no Remote Busy Status : no Next NS to Send : 0 Next NS Expected : 0 Link Level Matrix State : disconEnabled Flow Control State : off Retransmission Count : 0 Queue Size : 0 Number of Active SAPs : 1 Number of Active DLCs : 1

Displayed Information Description

DLSAP

The slot and line number for the PRI ISDN line

Number of Outstanding Frames

The number of outstanding frames to the MAC

Number of Frames Dropped by MAC

The number of frames dropped by the MAC

Local Busy Status

The local SAP busy state: no yes

Remote Busy Status

The remote SAP busy state: no yes

Next NS to Send

The next sequence number to send

Next NS Expected

The next Sequence Number expected

Link Level Matrix State

The state of the Link Level Matrix:

  • disconDisabled—disconnected disabled

  • connectingLL—Connecting Link Level

  • dataTransfer—Data Transfer mode

  • disconnectingLL—Disconnecting Link Level

  • connectAwaitTEI—Connecting - awaiting TEI

  • rstLLEnable—Resetting Link Level Enabled

  • rstLLDisable—Resetting Link Level Disabled

  • frameRejection—Frame Rejection

  • disconEnabled—Disconnected Enabled

  • assignAwaitTEI—Assign Awaiting TEII

Flow Control State

The flow control state: off, on

Retransmission Count

The count of retransmissions

Queue Size

The size of the queue

Number of Active SAPs

The number of active Service Access Points

Number of Active DLCs

The number of active Data Link Connections

Viewing DLSAP Statistics

To view DLSAP statistics for a line, use the lsdlsapstat command. The following example displays statistics for a DLSAP in slot 14, line 1.

lsdlsapstat 14.1

The system displays DLSAP statistics for the specified line:

======================================================================= Statistics for a DLSAP (lsdlsapstat) ======================================================================= DLSAP : 14.1 Information Frames (Received): 0 Information Frames (Transmitted): 0 Receive Ready Frames (Received): 0 Receive Ready Frames (Transmitted): 0 Receive Not Ready Frames (Received): 0 Receive Not Ready Frames (Transmitted): 0 SABM Frames (Received): 0 SABM Frames (Transmitted): 0 Disconnect Frames (Received): 0 Disconnect Frames (Transmitted): 0 UA Frames (Received): 0 UA Frames (Transmitted): 0 Disconnect Mode Frames (Received): 0 Disconnect Mode Frames (Transmitted): 0 Frame Reject Frames (Received): 0 Frame Reject Frames (Transmitted): 0 Exchange ID Frames (Received): 0 Exchange ID Frames (Transmitted): 0 Unnumbered Info Frames (Received): 0 Unnumbered Info Frames (Transmitted): 0

To view all DLSAP statistics, use the lsdlsapstats command. The system displays summary DLSAP statistics:

======================================================================= DLSAP Statistics (lsdlsapstats) ======================================================================= Slot.Line Received SABM Frames Received Info Frames Received Disc Frame ========= ==================== ==================== =================== 14.1 0 0 0

Configuring D Channels

The MGX 8260 Media Gateway communicates with PSTN equipment over Primary Rate Interface (PRI) ISDN D Channels.

Adding D Channels

Adding a D Channel requires an existing DS3 line and suitable DLSAP and MACSAP profiles. To add a D Channel, follow these steps:

Step 1   Specify the D Channel parameters using the adddchan command, as described in the "adddchan" section.

adddchan 11.1 1 1 24

Step 2   Verify the configuration using the lsdchan command.

Changing D Channels

To change a D Channel, delete the desired D Channel and then add a new one. When creating the new channel, choose a DLSAP and MACSAP profile that contains the desired settings. If such a profile doesn't exist, create one first before adding the new D Channel. For more information on the relationship between D Channels and profiles, see D Channel Configuration Tasks.

Deleting D Channels

To delete a D Channel, use the deldchan command. Specify the slot and line number, delimited by a period, of the D Channel you want to delete. The following example deletes the D Channel at slot 5, line 4.

deldchan 5.4

Viewing D Channels

You can view D Channels four ways:

To view bulk D Channel capacity, use the lslogicalcarddchans command.

The system displays the D Channel capacity by slot:

======================================================================= D-channels (lslogicalcarddchans) ======================================================================= slot number max number of D channels =============== ========================= 2 16 4 16

To view bulk D Channel capacity and usage, use the lslogicalcarddchan. Specify the slot number of desired card.

The system displays the D Channel usage for the specified card:

======================================================================= D-channels Entry (lslogicalcarddchan) ======================================================================= Slot Number : 2 Max Number of T1/E1 Lines : 16 D-channel info(line 1 -16) : 4 D-channel info(line 17 - 32) : 0 D-channel info(line 33 - 48) : 0 D-channel info(line 49 - 64) : 0 D-channel info(line 65 - 80) : 0 D-channel info(line 81 - 96) : 0 D-channel info(line 97 - 112) : 0 D-channel info(line 113 - 128) : 0 D-channel info(line 129 - 144) : 0 D-channel info(line 145 - 160) : 0 D-channel info(line 161 - 176) : 0 D-channel info(line 177 - 192) : 0

To view D Channel information for a single line, use the lsdchan command. Specify the slot and line number, delimited by a period, of the D Channel.

The system displays D Channel information for the specified channel. This information reflects the DLSAP and MACSAP profiles used when adding the D Channel.

======================================================================= D-Channel Entry (lsdchan) ======================================================================= DChannel Number : 14.1 DLSAP Index : 1 MACSAP Index : 1 DS0 : 1 Frame Length : 1960 Window Size : 7 Retransmission Count : 3 Congestion Timer : 200 t200 Timer : 1 t203 Timer : 10 Modulo : 128 TEI Assignment : 1 Maximum DLCs for this DLSAP : 1 TEI : 2 MAC SAP Interface : network Link Setup Arbitration : active LAPD Type : ccitt Maximum Outstanding Frames : 7 Timer Queue Upper Threshold : 1000 Timer Queue Lower Threshold : 100 Connection Timer : 500 T201 Timer : 20 T202 Timer : 2 TEI Check Timer : 5 N202 : 3 Lowest Range of Automatic TEI: 64 Keep MAC Up All The Time : true

Displayed Information Description

DChannel Number

The line that contains the D Channel.

DLSAP Index

The DLSAP index for this D Channel.

MACSAP Index

The MACSAP index for this D Channel.

DSO

The DS0 number this D Channel uses.

Frame Length

The frame length, which is the maximum number of octets in an information field. Values: 1 to 1960. Default: 1960

Window Size

The maximum number of sequentially numbered I-frames that may be outstanding. This window-size depends on the modulo. If the modulo is 8, then this range is (1 - 8) and if the modulo is 128, then the range of the window size is (1 - 128).

Retransmission Count

The maximum number of retransmissions of a frame. Values: 1 to 1023. Default: 3

Congestion Timer

The time after which DLCs are dropped during periods of network congestion, in seconds. Values: 1 to 1023. Default: 200

T200 Timer

The wait time before frame transmission may be initiated, in seconds. Values: 1 to 3. Default: 1

T203 Timer

The maximum time between retransmission of the TEI identity request message, in seconds. Values 20 to 60. Default: 10

Modulo

Each I-frame is sequentially numbered and may have values 0 through (N-1) where N is this modulus. Values: 8 or 128. Default: 128

TEI Assignment

The Terminal Endpoint Identifier Assignment setting:

    1. automatic—TEI is selected by the ASP Layer Management procedure on the network side.

    2. nonAutomatic—TEI is selected by the user. (default)

Maximum DLCs for this DLSAP

The maximum number of DLCs for this DLSAP. Values: 1 to 16. Default: 1

TEI

The starting number for reassigning TEIs. This number is used in conjunction with the previous two parameters to number TEIs. For example, if TEI Assignment is nonAutomatic, Maximum DLCs for this DLSAP is 4, and TEI is 14. When a D Channel is added, 4 TEIs starting at 14 are preconfigured. Values: 0 to 63

MACSAP Identifier

The MACSAP profile identifier. Values: 1 to 20

MACSAP Interface

The logical interface. Values:

    1. user

    2. network

Link Setup Arbitration

The link setup arbitration scheme. Values:

    1. passive

    2. active

LAPD Type

The LAPD interface type:

  • test—Test

  • ccitt—CCITT

  • att5EssBRA—AT&T 5ESS BRA

  • att5EssPRA—AT&T 5ESS PRA

  • att4Ess—AT&T 4ESS

  • ntDMS100BRA—NT dms100 BRA ntDMS100PRA—NT dms100 PRA

  • vn2or3—VN 2 or VN 3

  • insNet—INS Net

  • tr6MPC—tr6 MPC

  • tr6PBX—tr6 PBX

  • ausb—Austel Basic

  • ausp—Austel Primary

  • nISDN1—National ISDN-1

  • etsi—ETSI

  • bc303TMC—Bellcore tr303 tmc

  • bc303CSC—Bellcore tr303 csc

  • ntDMS250—NT dms250

  • bellcore—Bellcore

Maximum Outstanding Frames

The maximum number of sequentially numbered I-frames that may be outstanding. Values: 1 to 255

Timer Queue Upper Threshold

The upper threshold for I-frame queue. When the I-frame queue size exceeds this threshold, the congestion timer is started and flow-control is turned on. Values: 1 to 32767

Timer Queue Lower Threshold

The lower threshold for I-frame queue. When the I-frame queue size falls below this threshold, the congestion timer is stopped and flow-control is turned off. Values: 1 to 32767

Connection Timer

The connection timer. Values: 1 to 1024

T201 Timer

The minimum time between transmissions of the TEI Identity check message, in seconds. Values: 1 to 1024

T202 Timer

The minimum time between retransmission of the TEI Identity request message, in seconds. Values: 1 to 1024

TEI Check Timer

The TEI check timer. The value 1025 means the TEI Check Timer is disabled. Values: 1 to 1025, where 1025 = disables

N202

Minimum time between transmissions of TEI Identity check messages.

Lowest Range of Automatic TEI

The allocated TEI value. When configured for Automatic TEI Assignment, ASP can allocate TEIs greater than or equal to Lowest Automatic TEI. Values: 1 to 127

Keep MAC Up All The Time

The state of the Keep MAC Up All The Time flag. Values:

    1. False

    2. True

To view all D Channels, use the lsdchans command. The system displays summary information for D Channels:

============================================================= D Channels (lsdchans) ============================================================= Slot.Line Frame Len Window Size t200 Timer TEI ========= =========== ============ ========== ========== 14.1 1960 7 1 2 14.2 1960 7 1 2 14.3 1960 7 1 2 14.5 1960 7 1 2

For more information, see the description of displayed information for the lsdchan command.

Viewing LAPD Parameters

To view LAPD settings for a card, use the lslapd command. Specify the card number associated with the LAPD information.

======================================================================= LAPD General Configuration Information (lslapd) ======================================================================= Physical Card Number : 14 Number of Physical Links : 168 Number of DLCs : 10752 Number of DLCs per SAP : 168 Number of ASP Links : 168

Displayed Information Description

Physical Card Number

The physical card number

Number of Physical Links

The total number of physical links for this instance of LAPD on the card

Number of DLCs

The total number of DLCs for this instance of LAPD on the card

Number of DLCs per SAP

The total number of LAPD links for this instance of LAPD on the card

Number of ASP Links

The number of Assigned Source Points

To view LAPD settings for all cards, use the lslapds command. The system displays summary information for LAPD:

======================================================================= LAPD Card Entries (lslapds) ======================================================================= Card Physical Links Number of DLCs LD Links ASP Links ===== ============== ============== ======== ========= 14 168 10752 168 168

For more information, see the description of displayed information for the lsdchan command.

Configuration Tasks for IPDC

IPDC is an alternative for MGCP for controlling voice calls through the MGX 8260 Media Gateway. When using IPDC, you don't need to configure sessions or backhaul channels.

To configure IPDC, perform the following tasks:

Switching from MGCP to IPDC

The MGX 8260 Media Gateway supports two call control protocols, MGCP and IPDC. By default, MGCP is enabled and IPDC is disabled. To switch to IPDC you must change the active protocol type and reset the chassis.

Warning Switching protocols interrupts service. Perform this operation during light traffic periods or in a pre-arranged maintenance window.

To switch protocols, follow these steps:

Step 1   Change the protocol type using the chprotocol command, specifying 2 for IPDC; then confirm you action.

The system automatically reboots.

Step 2   After the system restarts, log in again and verify the change using the lsndinf command.

Configuring Soft Switch IP Addresses

Before beginning this procedure, obtain the IP addresses and ports that apply to your system. Make sure your IP and port selections do not conflict with other equipment on the network.

Step 1   Set the primary Soft Switch address and port using the chipdcpssip command as described in the "chipdcpssip" section.

Step 2   If your system includes a redundant Soft Switch, set the secondary IP address and port using the chipdcsssip command as described in the "chipdcsssip" section.

Step 3   Define the IPDC gateway IP address using the chipdcgwip command as described in "chipdcgwip" section.

Step 4   Verify the configuration using the lsipdc command.

Configuring a Pseudo IP Address

The MGX 8260 Media Gateway supports a single pseudo-IP address for the four broadband ports. Use this procedure to initialize this address.

To configure a pseudo-IP address, follow these steps:

Step 1   Specify a pseudo IP address for the four broadband ports using the chpseudoip command. Specify an IP address that is in the same subnet as the broadband ports.

Step 2   Verify the configuration using the lsipdc command.

Configuring IPDC Core Settings

To configure IPDC core settings, follow these steps:

Step 1   Specify the system ID using the chipdcssid command.

Step 2   Specify the system type chipdcsstype.

Step 3   Limit the number of IPDC modules supported using the chipdcmaxm command.

Step 4   Set the bay number using the chipdcssbaynum command.

Step 5   Set the numbering format using the chipdcssnumfor command.

Step 6   Verify the changes using the lsipdc command.

Configuring IPDC Timers and Counters

IPDC timers and counters control how the link behaves under abnormal or fault conditions. You can use the default settings, or provide a custom set.

To configure IPDC core settings, follow these steps:

Step 1   Set the IPDC link timers and retry counters using the chipdctimer command.

Step 2   Verify the changes using the lsipdctimer command.

Configuring COT Settings

To configure IPDC COT settings, follow these steps:

Step 1   Specify the IPDC COTs using the chipdccot command.

Step 2   Verify the changes using the lsipdccot command.

Activating IPDC and Link Health Check

To activate IPDC links, follow these steps:

Step 1   Enable the primary and secondary Soft Switch using the chipdcssadm command.

Step 2   Enable the primary and secondary health check feature using the chipdcsshlth command.

Step 3   Verify the link status using the lsipdc command.

Viewing IPDC Settings

You can view the following IPDC information:

To view IPDC IP settings, use the lsipdc command.

The following information is displayed:

========================================================================= IPDC Soft Switch Configuration (lsipdc) ========================================================================= Primary Soft Switch IP Address : 10.1.1.2 Primary Soft Switch TCP port : 5000 Secondary Soft Switch IP Address : 10.1.1.3 Secondary Soft Switch TCP port : 5000 Gateway IP Address : 10.1.1.1 Gateway TCP port : 5000 System Id : Cisco_MGX-8260 System Type : TDM_XCONN Pseudo IP Address : 0.0.0.0 Maximum Modules : 16 Bay Number : 00000001 Numbering Format : zeroBased Current Soft Switch : primary Operation Status (Current Soft Switch) : down Previous Operation Status (CSS) : down Date and time of last opst change : 07/24/2000 08:31:05 Primary Soft Switch Health Check : enabled Secondary Soft Switch Health Check : enabled Health Check Response Timer (msec) : 1000 Secondary Soft Switch Admin Status : down Graceful Down Timer (sec) : 0

Displayed Information Description

Primary Soft Switch IP Address

The IP address of the primary Soft Switch

Primary Soft Switch TCP port

The port number of the primary Soft Switch

Secondary Soft Switch IP Address

The IP address of the secondary Soft Switch

Secondary Soft Switch TCP port

The port number of the secondary Soft Switch

Gateway IP Address

The IP address of the gateway for IPDC traffic

Gateway TCP port

The port number of the gateway for IPDC traffic

System Id

The user-defined identifier for this system

System Type

The user-defined identifier for this system type

Pseudo IP Address

A single IP address that represents up to four broadband ports

Maximum Modules

The maximum number of IPDC modules

Bay Number

The number of this bay for IPDC purposes

Numbering Format

Specifies zero-based or one-based numbering for communicating with the Soft Switch

Current Soft Switch

The active Soft Switch

Operation Status (Current Soft Switch)

The operational state of the active Soft Switch

Previous Operation Status (CSS)

The previous operational state of the active Soft Switch

Date and time of last opst change

A date stamp for the last operational status change

Primary Soft Switch Health Check

The enable state of the primary Soft Switch health check

Secondary Soft Switch Health Check

The enable state of the secondary Soft Switch health check

Health Check Response Timer (msec)

The current setting for the health check response timer

Secondary Soft Switch Admin Status

The operational state of the backup Soft Switch

Graceful Down Timer (sec)

The current setting of the graceful shutdown timer

Viewing IPDC Timer and Retry Counter Information

To view IPDC timer and counter information, use the lsipdctimer command. The system displays the following information:

========================================================================= IPDC Timer Configuration (lsipdctimer) ========================================================================= Minimum Soft Switch Connection Retry Interval(msec) : 4000 Maximum Soft Switch Connection Retry Interval(msec) : 64000 TCP Connection Retry Interval(msec) : 2000 NSUP Message Retry Timer(msec) : 2000 Link Activity Testing Timer(msec) : 600000 Maximum TCP Connection Attempts : 1 Maximum NSUP Retransmission Attempts : 2 Health Check Response Timer (msec) : 1000 Graceful Down Timer (sec) : 0

Displayed Information Description

Minimum Soft Switch Connection Retry Interval

The minimum connection retry interval for primary or secondary Soft Switch when the link is up. The connection interval doubles with every retry attempt until the maximum value is reached.

Maximum Soft Switch Connection Retry Interval

The maximum Soft Switch connection retry interval, in milliseconds

TCP Connection Retry Interval

The retry interval for a TCP connection when the link is down, in milliseconds

NSUP Message Retry Timer

The retry interval for NSUP messages, in milliseconds

Link Activity Testing Timer

The time this device waits for a message from the Soft Switch before declaring the link down, in milliseconds. If the health check is enabled, the link stays up until the heartbeat times out.

Maximum TCP Connection Attempts

The maximum number of TCP connection attempts when the link is down.

Maximum NSUP Retransmission Attempts

The maximum NSUP retransmission attempts when the link is down.

Health Check Response Timer

Health check response timer in milliseconds

Graceful Down Timer

Graceful down timer in seconds

Viewing IPDC COT Information

To view IPDC COT information, use the lsipdccot command. The system displays the following statistical information:

========================================================================= IPDC COT Configuration (lsipdccot) ========================================================================= IPDC COT Receive Tone : co1 IPDC COT Transmit Tone : co1

Displayed Information Description

IPDC COT Receive Tone

The receive tone source.

IPDC COT Transmit Tone

The transmit tone source.


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Posted: Sat Sep 28 14:18:01 PDT 2002
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