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

Understanding MGCP

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

Figure 5-1: MGCP Protocol Stack

The protocol stack contains the following layers:

MGCP
UDP (User Datagram Protocol)
IP (Internet Protocol)
Physical—Ethernet LAN

Only the IP layer requires configuration. 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 or MGC for more reliable operation.

Configuration Tasks for MGCP

To configure MGCP, you perform the following tasks:

Set the domain name.
Set IP addresses and ports
Configure MGCP core settings
View message statistics
Set MPC scalars

Configuring the MGCP Domain Name and Viewing Connection Status

Before beginning this procedure, obtain the domain name for your MGCP interface.

To configure the domain name and view connection status information, follow these steps:

Step 1 On the Navigation pane, click Protocol.

Step 2 Click MGCP.

Step 3 Click Default.

The MGCP Default Setting screen opens.

Step 4 Interpret the connection status information as follows:

Parameter	Description
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
Con. Status Time Stamp	The time the connection status last changed.

Parameter

Description

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

Con. Status Time Stamp

The time the connection status last changed.

Step 5 In the Domain Name section, click Set.

The MGCP Domain Name Setting screen opens.

Step 6 Enter the domain name or IP address of the MGX 8260, and click Modify.

Configuring MGCP IP Addresses

Before beginning this procedure, obtain the IP addresses and ports for your MGCP interface. Make sure your IP and port selections do not conflict with other equipment on the networks.

To configure MGCP IP addresses, follow these steps:

Step 1 On the Navigation pane, click Protocol.

Step 2 Click MGCP.

Step 3 Click Default.

The MGCP Default Setting screen opens.

Step 4 Interpret the connection status information as follows:

Parameter	Description
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
Con. Status Time Stamp	The time the connection status last changed.

Parameter

Description

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

Con. Status Time Stamp

The time the connection status last changed.

Step 5 Click Set in either the Primary, Secondary, or Local sections of the MGCP Default Setting form.

The respective Primary MGCP Setting, Secondary MGCP Setting, or Local MGCP Setting form opens.

Step 6 Specify the MGCP parameters:

Parameter	Description
Primary MGCP Address 1	The IP address of the primary MGC for network 1. Use the standard dot notation for IP addresses.
Primary MGCP UDP Port 1	The default UDP port of the primary MGC for network 1.
Primary MGCP Address 2	The IP address of the primary MGC for network 2. Use the standard dot notation for IP addresses.
Primary MGCP UDP Port 2	The default UDP port of the primary MGC for network 2.
Secondary MGCP Address 1	The IP address of the secondary MGC for network 1. Use the standard dot notation for IP addresses.
Secondary MGCP UDP Port 1	The default UDP port of the secondary MGC for network 1.
Secondary MGCP Address 2	The IP address of the secondary MGC for network 2. Use the standard dot notation for IP addresses.
Secondary MGCP UDP Port 2	The default UDP port of the secondary MGC for network 2.
Local Address 1	The IP address of the Media Gateway interface for network 1. This address needs to be on the same subnet as the Primary MGCP Address. Specify the IP address in standard dot notation.
Local Primary Port 1	The primary UDP port of the Media Gateway interface for network 1.
Local Address 2	The IP address of the Media Gateway interface for network 2. This address needs to be on the same subnet as the Secondary MGCP Address. Specify the IP address in standard dot notation.
Local Primary Port 2	The primary UDP port of the Media Gateway interface for network 2.

Step 7 Click Modify. The system configures the MGCP IP addresses.

Configuring MGCP Core Settings

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

To configure MGCP core parameters, follow these steps:

Step 1 On the Navigation pane, click Protocol.

Step 2 Click MGCP.

Step 3 Click Core.

The MGCP Core Setting screen opens, displaying the status, settings, and other information related to MGCP messages.

Step 4 Interpret the core status information as follows:

Parameter	Description
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
Incoming Messages With Bad Version	The total number of incoming messages delivered to the protocol entity that were for an unsupported protocol version.
UnRecognized Packets	The number of unrecognized packets.
Capabilities Package Name	A list of the capabilities packages: Generic Media Package DTMF package MF Package Trunk Package Line Package Handset Package RTP Package Network Access Server Package Announcement Server Package Script Package

Step 5 Click Set.

The MGCP Core Setting screen opens.

Step 6 Enter new MGCP core parameters.

Parameter	Description
Request Timeout	The time to wait before retransmitting packets. Values: 1 to 100000.
Request Retries	The maximum number of retries for a request that times out. Values: 0 to 15.
Restart InProg. Maximum Waiting Delay	The maximum waiting delay, in milliseconds, before the Media Gateway interface sends the Restart In Progress message to the Media Gateway Controller. Values: 0 to 600000.
Restart Delay	The delay for a graceful shutdown. Values 0 to 600
Response TimeOut	The time in milliseconds to wait before retransmitting unacknowledged messages. Values: 1 to 100000.
Connectivity Timeout	The time in milliseconds to wait for a request from MGCP before dropping the link. Values: 1 to 100000.
Admin. Status	The desired state of the protocol. Click Set Admin Status to change the setting. 1—up - bring up protocol administratively 2—down - bring down protocol administratively 3—gracefulDown - gracefully shut down protocol

Step 7 Select (Set) Admin. Status.

Step 8 Select a setting.

Step 9 Click Set New Status to change the value and return to the MGCP Core Setting screen.

Step 10 Click Modify. The system configures the MGCP core settings.

Viewing Message Statistics

To view MGCP message statistics, follow these steps.

Step 1 On the Navigation pane, click Protocol.

Step 2 Click MGCP.

Step 3 Click Message Stats.

The MGCP Message Statistics screen opens, displaying the statistics.

Step 4 Click Display. The system refreshes the display of MGCP statistics.

Configuring Default Call Setup Parameters

Call setup requires the default type of network, packetization period, bandwidth, echo cancellation, silence suppression, type of service, resource reservation, and COT receive and transmit tones. This section describes how to set default values for these parameters.

To configure MCP scalars, follow these steps:

Step 1 On the Navigation pane, click Protocol.

Step 2 Click MGCP.

Step 3 Click MPC Scalars.

The MPC Scalar screen opens.

Step 4 Click Set.

The MPC Scalars Setting screen opens.

Step 5 Select new settings:

Parameter	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—G711 Mu -law encoding PCMA—G711 A-law encoding G729A G726_32K

Step 6 Click Modify.

The system configures the MGCP core settings.

Step 7 Go back to the MPC Scalars screen.

Step 8 Click Display.

The system refreshes the display of settings on the MPC Scalars screen.

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:

Session—a connection between two points, defined by a local IP address and port and a remote IP address and port. The Cisco MGX 8260 supports four sessions per set, two for each session group.
Session Group—a collection of one or more sessions for a single MGC. Typically, the individual sessions implement network redundancy. The Cisco MGX 8260 supports two session groups per set.
Session Set—a collection of session groups, typically used to group session groups for redundant MGCs. The Cisco MGX 8260 supports up to six session sets for a total of up to 24 sessions.

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:

Four sessions:

Session 1 (MGX 8260 Net 1 to Active MGC Net 1)
Session 2 (MGX 8260 Net 1 to Standby MGC Net 1)
Session 3 (MGX 8260 Net 2 to Active MGC Net 2)
Session 4 (MGX 8260 Net 2 to Standby MGC Net 2)

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

Two session groups:

Session group1 (session 1 and session 3)
Session group2 (session 2 and session 4)

One session set containing session group 1 and group 2.

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:

Add session sets
Add session groups
Add sessions

Configuring Session Sets

You can view and set session sets.

Viewing Session Set Information

To view session set status, follow these steps:

Step 1 On the Navigation pane, click Protocol.

Step 2 Click Backhaul.

Step 3 Click Set.

The Session Set screen opens.

Step 4 View the session set summary.

Displayed Information	Description
Index	The session set index number.
State	The state of the session set: idle outOfService standby active full switchOver
Total Groups	The total number of groups added to this Session Set.
Min Slot	The minimum MGX 8260 slot number for this Session Set.
Min Line	The minimum line number for this Session Set.
Max Slot	The maximum MGX 8260 slot number for this Session Set.
Max Line	The maximum line number for this Session Set.
Redun Mode	The current redundancy mode: nonFaultTolerant faultTolerant
Active Group	The group number which is in the Active state. Displays -1 if no group is active.
Switch Failed	The total number of switchover failures.
Switch Succeeded	The total number of switchover successes.
Down Count	The number of times the session set went down.

Adding a Session Set

To add a session set, follow these steps:

Step 1 On the Navigation pane, click Protocol.

Step 2 Click Backhaul.

Step 3 Click Set.

The Session Set screen opens.

Step 4 Click the + icon.

The Add Session Set form opens.

Step 5 Configure the session set parameters.

Parameter	Description
Set Index	An index number for the new set.
Redundant Mode	The redundancy mode: nonFaultTolerant faultTolerent
Minimum Slot Number	The minimum MGX 8260 slot number for this Session Set. Range: 1-8 and 11-16
Maximum Slot Number	The maximum MGX 8260 slot number for this Session Set. Range: 1-8 and 11-16
Minimum Line Number	The minimum line number for this Session Set. Range if Min Slot is a BSC: 1-168 Range if Min Slot is a NSC: 1-16
Maximum Line Number	The maximum line number for this Session Set. Range if Max Slot is a BSC: 1-168 Range if Max Slot is a NSC: 1-16

Step 6 Click Add.

Deleting a Session Set

To delete a session set, follow these steps:

Step 1 On the Navigation pane, click Protocol.

Step 2 Click Backhaul.

Step 3 Click Set.

The Session Set screen opens.

Step 4 Click the - icon for the set you want to delete; then confirm your action.

Configuring Session Groups

You can view and add session groups.

Viewing Session Group Information

To view session set status, follow these steps:

Step 1 On the Navigation pane, click Protocol.

Step 2 Click Backhaul.

Step 3 Click Group.

The Session Group screen opens.

Step 4 View the session group summary.

Displayed Information	Description
Set Index	The set number to which this group belongs
Gr. Index	The group index number
Gr. State	The state of the session group: outOfService inService
Use State	The use state of the session group: none standby active
Act. Sess	The active session number of the Group. Displays -1 if no session is active.
Prev Sess	The previously active session set ID of the Group.
Total Sess	The total number of sessions for the Group.
Total Act Sess	The total number of active sessions in the Group
Sess Fail	The total number of session failures for the Group.
Fail Over Success	The total number of failover successes for this Group.
Active Pkts Rcvd	The total number of packets Received for this Group.
Standby Pkts Rcvd	The total number of packets sent by this Group.
PDU Post Err	The total number of active packets received for this Group.

Adding a Session Group

To add a session group, follow these steps:

Step 1 On the Navigation pane, click Protocol.

Step 2 Click Backhaul.

Step 3 Click Group.

The Session Group screen opens.

Step 4 Click the + icon.

The Add Session Group form opens.

Step 5 Configure the session group parameters.

Parameter	Description
Session Group Index Number	A group number for the new group.
Session Set Index Number	The index number of the set to which this group belongs.

Step 6 Click Add.

Deleting a Session Group

To delete a session group, follow these steps:

Step 1 On the Navigation pane, click Protocol.

Step 2 Click Backhaul.

Step 3 Click Group.

The Session Group screen opens.

Step 4 Click the - icon for the group you want to delete; then confirm your action.

Configuring sessions

You can view and add sessions.

Viewing Session Information

To view session status, follow these steps:

Step 1 On the Navigation pane, click Protocol.

Step 2 Click Backhaul.

Step 3 Click Session.

The Session screen opens.

Step 4 View the session summary.

Displayed Information	Description
Set Index	The session set to which the group containing the session manger belongs.
Group Index	The session group of which the session is a member.
Sess. Index	The session number.
Priority	The session connection priority.
State	The session state: open openWait openXfer close closeWait userClose autoReset
InUse State	The use state of the session: outOfService inService blocked
Local Port	The local UDP Port.
Local addr	The local IP address of the connection.
Remote Port	The remote UDP port.
Remote Addr	The remote IP address of the connection.

Adding a Session

To add a session connection, follow these steps:

Step 1 On the Navigation pane, click Protocol.

Step 2 Click Backhaul.

Step 3 Click Session.

The Session screen opens.

Step 4 Click the + icon.

The Add Session form opens.

Step 5 Set the Session Index, Group Index, and Set Index.

Parameter	Description
Session Index	The session identifier. A session represents a 'physical' connection between the media gateway and media gateway controller.
Group Index	Session group identifier. A session group consists of one or more RUDP sessions.
Set Index	The session set identifier. A session set is a collection of session groups, each connecting to a different media gateway controller. Use session sets for redundant media gateway controller architectures.

Step 6 Configure the session connection parameters.

Parameter	Description
Priority	The session priority.
Local Port	The local port for the session.
Local Address	The local IP address for the session.
Remote Port	The remote port for the session.
Remote Address	The remote IP address for the session.

Step 7 Click Add.

Deleting a Session

To delete a session, follow these steps:

Step 1 On the Navigation pane, click Protocol.

Step 2 Click Backhaul.

Step 3 Click Session.

The Session screen opens.

Step 4 Click the - icon for the manager you want to delete; then confirm your action.

Viewing Session Counters

To view session counters, follow these steps:

Step 1 On the Navigation pane, click Protocol.

Step 2 Click Backhaul.

Step 3 Click Session.

The Session screen opens.

Step 4 Click the C icon on the session of interest.

Step 5 The Session Counters screen opens, displaying session counter values.

Understanding ISDN D Channels Usage

The MGX 8260 Media Gateway extends 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 Cisco MGX 8260 simplifies the process by grouping common settings into two types of profiles:

Digital Link Service Access Profile
Media Access Control Service Access Profile

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.

Configuration Tasks for D Channels

The Cisco MGX 8260 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 section describes the high-level procedure for configuring a D Channel on an existing DS3 trunk:

Step 1 Define a DLSAP profile (see Adding a MACSAP Profile).

Step 2 Define a MACSAP profile (see Adding a DLSAP 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 (see Adding D Channels).

Adding a MACSAP Profile

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

To add a MACSAP profile, follow these steps:

Step 1 On the Navigation pane, click Protocol.

Step 2 Click ISDN.

Step 3 Click Macsap Profile.

The Macsap Profile screen opens.

Step 4 Click the + icon.

The Add Macsap Profile form opens.

Step 5 Specify the Macsap profile parameters.

Parameter	Description
Profile Index	A numeric identifier for the profile. Values: 1 to 20
MACSAP Interface	The type of profile. Value: network
Link Setup Arbitration Scheme	The link setup arbitration scheme. Values: passive or active.
LAPD Type	The LAPD interface type
Maximum Outstanding Frames	The maximum number of sequentially numbered I-frames that may be outstanding. Values: 1 to 255
Timer Queue Up 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 Low 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: true or false

Step 6 Click Add. The system adds the profile and updates the Macsap Profile screen.

Note If you add an incorrect profile, delete the profile using the - icon and start over.

Adding a DLSAP Profile

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

To add a DLSAP profile, follow these steps:

Step 1 On the Navigation pane, click Protocol.

Step 2 Click ISDN.

Step 3 Click Dlsap Profile.

The Dlsap Profile screen opens.

Step 4 Click the + icon.

The Add Dlsap Profile form opens.

Step 5 Specify the Dlsap profile parameters.

Parameter	Description
Profile Index	A numeric identifier for the profile. Values: 1 to 20.
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).
Maximum Retransmissions 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
Modulus	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 Assign	The Terminal Endpoint Identifier assignment setting: 1. automatic—TEI is selected by the ASP Layer Management procedure on the network side. Default: 2, which yields a TEI of 1. 2. nonAutomatic—TEI is selected by the user (default)
Max DLCs	The maximum number of DLCs for this DLSAP. Values: 1 to 16. Default: 1
Starting TEIs	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

Step 6 Click Add. The system adds the profile and updates the Dlsap Profile screen.

Deleting a Profile

To delete a dlsap or macsap profile, follow these steps:

Step 1 On the Navigation pane, click Protocol.

Step 2 Click ISDN.

Step 3 Click Dlsap Profile or Macsap Profile.

The Dlsap Profile or Macsap Profile screen opens.

Step 4 Click the - icon for the profile you want to delete; then confirm your action.

Viewing LAPD Parameters

You don't need to configure LAPD, but you can view its status.

To view LAPD status, follow these steps:

Step 1 On the Navigation pane, click Protocol.

Step 2 Click ISDN.

Step 3 Click Lapd.

The LAPD Card Table screen opens.

Step 4 View the LAPD summary.

Displayed Information	Description
Card Index	The physical card number
Number of Phy. Links	The total number of physical links for this instance of LAPD on the card
Num of DLCs	The total number of DLCs for this instance of LAPD on the card
Num of LAPD Links	The total number of LAPD links for this instance of LAPD on the card
Num of ASPs	The number of Assigned Source Points

Step 5 Click Back to close the screen.

Adding D Channels

The Cisco MGX 8260 communicates with PSTN equipment over Primary Rate Interface (PRI) ISDN 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 On the Navigation pane, click Protocol.

Step 2 Click ISDN.

Step 3 Click DChan Config.

The DChan Config screen opens.

Step 4 Click the + icon.

The Add D Channel Configuration form opens.

Step 5 Specify the D Channel parameters.

Parameter	Description
Slot	The slot number for this D Channel
Line	The line number for this D Channel.
Contiguous Creating Lines	The number of D Channels to add.
DLSAP Profile Number	The instance number of a DlSap profile. The profile defines a template for the configuration; the DlSap instance number is created from the template.
Ds0 Number	The time slot to use for the D Channel
MacSap Profile Number	The instance number of a MacSap profile. The profile defines a template for the configuration; the MacSap instance number is created from the template.
Ds0 Format	The D Channel format, either 56 or 64 kbps

Step 6 Click Add. The system adds the D Channel and updates the DChan Config screen.

Changing a D Channel

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 Configuration Tasks for D Channels.

Deleting a D Channel

To delete a D Channel, follow these steps:

Step 1 On the Navigation pane, click Protocol.

Step 2 Click ISDN.

Step 3 Click DChan Config.

The DChan Config screen opens.

Step 4 Click the - icon for the D Channel you want to delete; then confirm your action.

Viewing D Channel Details

To view D Channel detail information, follow these steps:

Step 1 On the Navigation pane, click Protocol.

Step 2 Click ISDN.

The DChan Config screen opens.

Step 3 Click the i icon on the D Channel of interest.

The system displays configuration information for the D Channel.

Viewing D Channel Counters

To view D Channel counters, follow these steps:

Step 1 On the Navigation pane, click Protocol.

Step 2 Click ISDN.

The DChan Config screen opens.

Step 3 Click the i icon on the D Channel of interest.

The system displays Counter information for the D Channel.

Viewing DLSAP Counters

To view DLSAP counters, follow these steps:

Step 1 On the Navigation pane, click Protocol.

Step 2 Click ISDN.

The DChan Config screen opens.

Step 3 Click the A icon on the D Channel of interest.

The system displays DLSAP Counter information for the D Channel.

Viewing MACSAP Counters

To view MACSAP counters, follow these steps:

Step 1 On the Navigation pane, click Protocol.

Step 2 Click ISDN.

The DChan Config screen opens.

Step 3 Click the C icon on the D Channel of interest.

The system displays MACSAP Counter information for the D Channel.

Configuration Tasks for IPDC

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

To configure IPDC, perform the following tasks:

Switch from MGCP to IPDC
Set IP addresses and ports
Configure core settings
Configure link timers
Configure COT tones
Activate the protocol
View IPDC configuration and status

Switching from MGCP to IPDC

The Cisco MGX 8260 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 On the Navigation pane, click Node.

Step 2 Click System.

Step 3 On the Configuration Setting form, click the Set link on the Gateway Control Protocol line. The System Gateway Control Protocol Setting form opens.

Step 4 Select the protocol type, either MGCP or IPDC.

Step 5 Click Modify. The system resets and drops your management session.

Step 6 Log in and continue configurations.

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.

To IPDC IP addresses, follow these steps:

Step 1 On the Navigation pane, click Protocol.

Step 2 Click IPDC.

Step 3 Click Configuration.

The IPDC Configuration screen opens, which includes the Soft Switch Configuration form:

The form displays IP addresses and operational status for the Soft Servers. To change the settings, perform the following steps.

Step 4 In the Gateway section, click Set.

The IPDC Gateway Setting form opens.

Step 5 Specify the IP gateway parameters.

Parameter	Description
IP Address	The IP address of the gateway router for IPDC traffic, expressed in standard dot notation.
TCP Port	The TCP port to use. Values: 1025 to 65535. Default: 5000

Step 6 Click Modify; then click Display IPDC Configuration. The IPDC Configuration screen reopens.

Step 7 In the Primary Soft Switch section, click Set.

The Primary Soft Switch Setting form opens.

Step 8 Specify the primary Soft Switch parameters.

Parameter	Description
IP Address	The IP address of the primary Soft Server, expressed in standard dot notation.
TCP Port	The TCP port to use. Values: 1025 to 65535. Default: 5000
Health Check	The link health check feature. Values: enabled or disabled. Default: enabled
Administrative Status	The operational status of the link. Values: up or down. Default: down

Step 9 Click Modify; then click Display IPDC Configuration. The IPDC Configuration screen reopens.

Step 10 For redundancy, click Set in the Secondary Soft Switch section and repeat Steps 8 and 9.

Configuring a Pseudo IP Address

The Cisco MGX 8260 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 On the Navigation pane, click Protocol.

Step 2 Click IPDC.

Step 3 Click Configuration.

The IPDC Configuration screen opens, which includes the Status and Core Setting form:

Step 4 In the Pseudo IP Address section, click Set.

The IPDC Pseudo IP Address Setting form opens.

Step 5 Specify the pseudo-IP address, in standard dot notation. Select an IP address that is in the same subnet as the broadband ports.

Step 6 Click Modify; then click Display IPDC Configuration. The IPDC Configuration screen reopens.

Configuring IPDC Core Settings

To configure IPDC core settings, follow these steps:

Step 1 On the Navigation pane, click Protocol.

Step 2 Click IPDC.

Step 3 Click Configuration.

The IPDC Configuration screen opens, which includes the Status and Core Setting form:

The form displays current operational status for the Soft Switches, along with configuration information for the core settings. To change the core settings, perform the following steps.

Step 4 In the upper section, click Set.

The IPDC Configuration Setting form opens.

Step 5 Specify the core IPDC parameters.

Parameter	Description
System ID	An identifier for the gateway being controlled by IPDC protocol. Value: Text string from 0 to 24 characters.
System Type	An identifier for the manufacturer and model of the access server. Value: Text string of exactly 9 characters
Maximum number of modules supported	Maximum number of modules (slot cards) supported. Values: 1 to 16
Bay Number of the gateway being controlled	The number associated with Cisco MGX 8260 being controlled. Value: Text string of exactly 8 characters.
Number Format	The numbering format that the Soft Switch uses to interpret module, line, and channel numbers on an MGX 8260. Values: zeroBased or oneBased.
Health Check Response Timer	The time to wait after sending the heartbeat before bringing down the link. Values: 400 to 10000 msec. Default 1000
Graceful Down Timer	The graceful disconnect time for both Soft Switches. Values: integer seconds from 0 - 32767 seconds. Value: 0 (no graceful down)

Step 6 Click Modify; then click Display IPDC Configuration. The IPDC Configuration screen reopens.

Configuring COT Settings

To configure continuity test settings, follow these steps:

Step 1 On the Navigation pane, click Protocol.

Step 2 Click IPDC.

Step 3 Click Configuration.

The IPDC Configuration screen opens, which includes the COT Configuration form:

The form displays the current COT configuration. To change the settings, perform the following steps.

Step 4 Click Set.

The IPDC COT Configuration Setting form opens.

Step 5 Specify the core COT parameters.

Parameter	Description
COT Receive Tone	IPDC COT receive tone. Values: co1 (2010 Hz) or co2 (1780 Hz)
COT Transmit Tone	IPDC COT transmit tone. Values: co1 or co2

Step 6 Click Modify.

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 a IPDC timers, follow these steps:

Step 1 On the Navigation pane, click Protocol.

Step 2 Click IPDC.

Step 3 Click Timer.

The IPDC Timer Configuration screen opens:

The form displays the current timer and counter configurations. To change these settings, perform the following steps.

Step 4 Click Set.

The IPDC Timer Configuration Setting form opens.

Step 5 Specify the timer parameters.

Minimum Soft Switch Connection Retry Interval when link is up	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 ssConnRetryThr value is reached. Values: integer 2000 to 15000 msec. Default: 4000 msec
Maximum Soft Switch Connection Retry Interval for backoff scheme	Maximum Soft Switch connection retry interval. Values: integer 16000 to 256000 msec. Default: 64000 msec
TCP Connection Retry Interval when link is not up	Retry interval for a TCP connection when the link is down. Values: 1000 to 10000 msec. Default: 2000 msec
NSUP Message Retry Timer, which stops after receive of ASUP	Retry interval for NSUP message. The timer stops after receipt of ASUP. Values: 1000 to 10000 msec. Default: 2000 msec
Link Activity Testing Timer when link is down	The time this device waits for a message from the Soft Switch before declaring the link down. If the health check is enabled, the link stays up until the heartbeat times out. Values: 1000 to 600000 msec. Default 60000 msec
Maximum TCP Connection Attempts when link is down	The maximum number of TCP connection attempts when the link is down. Values 0 to 10. Default: 1 retry
Maximum NSUP Retransmission Attempts when link is down	The maximum NSUP retransmission attempts when the link is down. Values: 0 to 10. Default 2 attempts

Step 6 Click Modify.

Activating IPDC and the Health Check

To activate IPDC links, follow these steps:

Step 1 On the Navigation pane, click Protocol.

Step 2 Click IPDC.

Step 3 Click Configuration.

The IPDC Configuration screen opens, which includes the Soft Switch Configuration form:

Step 4 Click Modify; then click Display IPDC Configuration. The IPDC Configuration screen reopens.

Step 5 In the Primary Soft Switch or Secondary Soft Switch section, click Set.

The Primary Soft Switch Setting or Secondary Soft Switch Setting form opens.

Step 6 Activate the protocol and health check.

Parameter	Description
Health Check	The link health check feature. Values: enabled or disabled. Default: enabled
Administrative Status	The operational status of the link. Values: Up or Down. Default: down

Step 7 Click Modify; then click Display IPDC Configuration. The IPDC Configuration screen reopens.

Table of Contents

Call Control Interface Configuration

Understanding MGCP

Configuring the MGCP Domain Name and Viewing Connection Status

Configuring MGCP IP Addresses

Configuring MGCP Core Settings

Viewing Message Statistics

Configuring Default Call Setup Parameters

Understanding Sessions

Configuring Session Groups

Configuring sessions

Understanding ISDN D Channels Usage

Configuration Tasks for D Channels

Adding a MACSAP Profile

Adding a DLSAP Profile

Viewing LAPD Parameters

Adding D Channels

Changing a D Channel

Deleting a D Channel

Viewing D Channel Details

Viewing D Channel Counters

Viewing DLSAP Counters

Viewing MACSAP Counters

Switching from MGCP to IPDC

Configuring Soft Switch IP Addresses

Configuring a Pseudo IP Address

Configuring IPDC Core Settings

Configuring COT Settings

Configuring IPDC Timers and Counters

Activating IPDC and the Health Check