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Configuring the 8-Port and 16-Port FXS RJ-21 Modules

Configuring the 8-Port and 16-Port FXS RJ-21 Modules

This chapter describes how to configure the 8-port and 16-port FXS modules on the Cisco Catalyst 4000 Access Gateway Module (AGM).

Note   In this chapter, all references to the 8-port FXS module also apply to the 16-port FXS module unless otherwise noted.

The chapter contains the following major sections:

About the 8-Port RJ-21 FXS Module

The 8-Port RJ-21 FXS Module is a high-density analog phone and fax relay interface. By providing service to analog phones and fax machines, the eight Foreign Exchange Station (FXS) ports emulate a Public Switched Telephone Network (PSTN) central office (CO) or private branch exchange (PBX).

8-Port RJ-21 FXS Module User Interface Conventions

The 8-port FXS module is similar to the 2-port FXS analog interface card (VIC-2FXS). The ports on the 8-Port FXS module are sequentially numbered, starting with 0 for the right-most port and increasing by one from right to left. As the 8-port FXS module is located in slot 4, the eight ports are numbered 4/0 to 4/7.

Configuring FXS Voice Ports

Although the default values are adequate for FXS voice ports, under some circumstances you might need to change these values.

This section contains the following subsections:

Changing Default Configurations

To configure FXS voice ports, enter the following commands in privileged EXEC mode:

Command Purpose

configure terminal

Enters global configuration mode.

voice-port slot-number/port

Identifies the voice slot and port number you want to configure, and enter voice port configuration mode.

signal {loop-start | ground-start}

Selects the appropriate signal type for this interface.

cptone country

Selects the appropriate voice call progress tone for this interface.
The default for this command is us. For a list of supported countries, refer to the Voice, Video, and Home Applications Command Reference.

ring frequency {25 | 50}

Selects the appropriate ring frequency (in Hertz) specific to the equipment attached to this voice port.

connection plar string

(Optional) Specifies the PLAR1 connection if this voice port is used for a PLAR connection.
The string value is any series of digits that specifies the destination E.164 telephone number.

music-threshold number

(Optional) Specifies the threshold (in decibels) for music on hold. Valid entries are from -70 to -30.

description string

(Optional) Attaches descriptive text about this voice port connection.

comfort-noise

(Optional) Specifies that background noise will be generated.

1Private line automatic ringdown

For complete information about configuration commands and about configuring LAN and WAN interfaces on your switch, refer to the Cisco IOS configuration guides and command references.

The following example shows how to use the FXS configuration commands:

    gateway# conf t Enter configuration commands, one per line. End with CNTL/Z. gateway(config)#voice-port 4/0 gateway(config-voiceport)#signal loopStart gateway(config-voiceport)#cptone IN gateway(config-voiceport)#ring frequency 50 gateway(config-voiceport)#connection plar 5265761 gateway(config-voiceport)#music-threshold -50 gateway(config-voiceport)#description "Connection to PBX" gateway(config-voiceport)#comfort-noise

To display the values configured, use the show running-config command.

Validating the Configuration

To validate your voice port configuration, perform one or both of the following steps:

Step 1   Pick up the handset of an attached telephony device and check for a dial tone. If the dial tone stops when you dial a digit, then the voice port is probably configured properly.

Step 2   To confirm that the data is configured correctly, use the show voice port command as follows:

    gateway# sh voice port 4/0 Foreign Exchange Station 4/0 Slot is 4, Port is 0 Type of VoicePort is FXS Operation State is DORMANT Administrative State is UP No Interface Down Failure Description is "Connection to PBX" Noise Regeneration is enabled Non Linear Processing is enabled Music On Hold Threshold is Set to -50 dBm In Gain is Set to 0 dB Out Attenuation is Set to 0 dB Echo Cancellation is enabled Echo Cancel Coverage is set to 8 ms Playout-delay Mode is set to default Playout-delay Nominal is set to 60 ms Playout-delay Maximum is set to 200 ms Connection Mode is plar Connection Number is 5265761 Initial Time Out is set to 10 s Interdigit Time Out is set to 10 s Ringing Time Out is set to 180 s Companding Type is u-law Region Tone is set for IN Analog Info Follows: Currently processing none Maintenance Mode Set to None (not in mtc mode) Number of signaling protocol errors are 0 Impedance is set to 600r Ohm Wait Release Time Out is 30 s Station name None, Station number None Voice card specific Info Follows: Signal Type is loopStart Ring Frequency is 50 Hz Hook Status is On Hook Ring Active Status is inactive Ring Ground Status is inactive Tip Ground Status is inactive Digit Duration Timing is set to 100 ms InterDigit Duration Timing is set to 100 ms Ring Cadence is defined by CPTone Selection Ring Cadence are [4 2] [4 20] * 100 msec

Troubleshooting the Configuration

If you are having trouble placing a call and you suspect the problem is associated with the voice port configuration, you might be able to resolve the problem by performing one or more of the following tasks:

Step 1   Ping the associated IP address to confirm connectivity, as follows:

      gateway# ping 172.20.59.93 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 172.20.59.93, timeout is 2 seconds: !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 1/1/4 ms
If you cannot successfully ping your destination, refer to the Network Protocols Configuration Guide, Part 1.

Step 2   Use the show voice port command to ensure that the port is enabled (administrative state is UP), as follows:

      gateway# sh voice port 4/0 Operation State is DORMANT Administrative State is UP
If the port state is DOWN, as in the following display, use the no shutdown command to enable the port. (See the "Activating the Voice Port" section.)

    Operation State is DOWN Administrative State is DOWN

Fine-Tuning FXS Voice Ports

Depending on the specifics of your particular network, you might need to fine-tune the FXS voice port settings. Under most circumstances, the default values will suffice; however, if you need to change them, enter the following commands in privileged EXEC mode.

Command Purpose

configure terminal

Enters global configuration mode.

voice-port slot_number/port

Identifies the voice slot and port number you want to configure, and enter voice port configuration mode.

input gain value

Specifies (in decibels) the amount of gain to be inserted at the receiver side of the interface. Acceptable values are from -6 to 14.

output attenuation value

Specifies (in decibels) the amount of attenuation at the transmit side of the interface. Acceptable values are from 0 to 14.

echo-cancel enable

Enables echo-cancellation of voice that is sent out through the interface and received back on the same interface.

echo-cancel coverage value

Adjusts the size (in milliseconds) of the echo-cancel. Acceptable values are 16, 24, and 32.

impedance value

Specifies the impedance of the port.

The functional values are 600r (the default) and complex2 (an 820 ohm in series with (220 ohm | 120 nF)).

non-linear

Enables nonlinear processing, which shuts off any signal if no near-end speech is detected. (Nonlinear processing is used with echo-cancellation.)

timeouts initial seconds

Specifies the number of seconds that the system will wait for the caller to enter the first digit of the digits to be dialed. Valid entries are from 0 to 120.

timeouts interdigit seconds

Specifies the number of seconds the system will wait (after the caller has entered the initial digit) for the caller to enter a subsequent digit. Valid entries are from 0 to 120.

timing digit milliseconds

If the voice port dial type is dual tone multifrequency (DTMF), configure the duration (in milliseconds) of the DTMF digit signal. The range of the duration is from 50 to 100; the default is 100.

timing inter-digit milliseconds

If the voice port dial type is DTMF, configure the duration (in milliseconds) of the DTMF interdigit signal. The range of the duration is from 50 to 500; the default is 100.

For complete information about configuration commands and about configuring LAN and WAN interfaces on your switch, refer to the Cisco IOS configuration guides and command references.

The following example shows how to use the fine-tune FXS commands:

    gateway# conf t Enter configuration commands, one per line. End with CNTL/Z. gateway(config)#voice-port 4/0 gateway(config-voiceport)#input gain 10 gateway(config-voiceport)#output attenuation 10 gateway(config-voiceport)#echo-cancel enable gateway(config-voiceport)#echo-cancel coverage 8 gateway(config-voiceport)#non-linear gateway(config-voiceport)#timeouts initial 10 gateway(config-voiceport)#timeouts interdigit 10 gateway(config-voiceport)#timing digit 60 gateway(config-voiceport)#timing inter-digit 60

To display the values configured, use the show running-config command, as follows:

    gateway# sh running-config ! voice-port 4/0 input gain 10 output attenuation 10 echo-cancel coverage 8 timeouts initial 10 timeouts interdigits 10 timing digit 60 timing inter-digit 60 !

Activating the Voice Port

By default, the configured voice ports are active. However, if you need to activate a port because it has been shut down explicitly, use the no shutdown command, as follows:

    gateway# conf t Enter configuration commands, one per line. End with CNTL/Z. gateway(config)#voice-port 4/0 gateway(config-voiceport)#no shutdown gateway(config-voiceport)# 00:55:53:%LINK-3-UPDOWN:Interface Foreign Exchange Station 4/0, changed state to up

To deactivate a port, use the shutdown command, as follows:

    gateway# conf t Enter configuration commands, one per line. End with CNTL/Z. gateway(config)#voice-port 4/0 gateway(config-voiceport)#shutdown gateway(config-voiceport)# 00:55:23:%LINK-3-UPDOWN:Interface Foreign Exchange Station 4/0, changed state to Administrative Shutdown

Sample Configuration

This section provides a sample configuration for sending a fax or a call from the Cisco 2610 (a voice-enabled router) to the 8-port FXS module on a Catalyst 4000 family switch, and vice versa.

Note   You can substitute any voice-enabled router for the Cisco 2651XM and any Fast Ethernet interface connected to an IP network.

In the sample configuration, Fax1 is connected through an FXS port to the Cisco 2610 router. The router is connected through Fast Ethernet to the 8-Port FXS module, which is connected through an FXS port to Fax2.


Figure 6-1: Configuration for Connecting Fax through a Catalyst 4000 family switch


The following template can be used to implement the above configuration:

Dial-Peer Tag1 Destination Pattern2 Type Voice Port Session Target3 Codec
For Cisco 2651XM

1

10

POTS

1/1/0

—

G.711 (default)

2

20

VOIP

—

172.20.59.93

G.729 (default)

For 8-Port and 16-Port RJ-21 FXS Module

1

20

POTS

4/0

—

G.711 (default)

2

10

VOIP

—

172.20.59.61

G.729 (default)

1Assigns a unique number (1, 2,...) to a dial peer. Has only local significance.
2Assigns phone numbers to dial peers. The router directs voice calls based on these patterns.
3Identifies the remote end of the VoIP call, which can be specified using an IP address (as shown in the configuration) or a DNS name.

Using the configuration template above, you could configure the Cisco 2600 as follows:

    [Configure the fast ethernet interface] 2600# conf t Enter configuration commands, one per line. End with CNTL/Z. 2600(config)# interface FastEthernet0/0 2600(config-if)# ip address 172.20.59.61 255.255.255.0 [Configure the POTS call leg, as shown in the template above] 2600(config-if)# dial-peer voice 1 pots 2600(config-dial-peer)# destination-pattern 10 2600(config-dial-peer)# port 1/1/0 [Configure the VOIP call leg, as shown in the template above] 2600(config-dial-peer)# dial-peer voice 2 voip 2600(config-dial-peer)# destination-pattern 20 2600(config-dial-peer)# session target ipv4:172.20.59.93

Similarly, the 8-Port RJ-21 FXS module could be configured as follows:

    [Configure the fast ethernet interface] gateway# conf t Enter configuration commands, one per line. End with CNTL/Z. gateway(config)# interface FastEthernet5/0 gateway(config-if)# ip address 172.20.59.93 255.255.0.0 [Configure the POTS call leg as shown in the template above] gateway(config-if)# dial-peer voice 1 pots gateway(config-dial-peer)# destination-pattern 20 gateway(config-dial-peer)# port 4/0 [Configure the VOIP call leg, as shown in the template above] gateway(config-dial-peer)# dial-peer voice 2 voip gateway(config-dial-peer)# destination-pattern 10 gateway(config-dial-peer)# session target ipv4:172.20.59.61

At this point, you should be able to send a fax or phone call from the Cisco 2600 to the FXS module, and vice versa.

To display the values configured on the Cisco 2600, use the show running-config command, as follows:

    2600# sh running-config Building configuration... Current configuration:951 bytes ! version 12.1 no service single-slot-reload-enable service timestamps debug uptime service timestamps log uptime no service password-encryption ! hostname 2600 ! no logging buffered no logging buffered logging rate-limit console 10 except errors ! ip subnet-zero no ip finger ! frame-relay switching no mgcp timer receive-rtcp ! interface FastEthernet0/0 ip address 172.20.59.61 255.255.255.0 duplex auto speed auto ! interface FastEthernet0/1 ip address 192.100.1.156 255.255.255.0 shutdown duplex auto speed auto ! ip classless ip route 8.1.1.0 255.255.255.0 30.1.1.1 no ip http server ! snmp-server packetsize 4096 call rsvp-sync ! voice-port 1/1/0 ! voice-port 1/1/1 ! dial-peer cor custom ! dial-peer voice 1 pots destination-pattern 10 port 1/1/0 ! dial-peer voice 2 voip destination-pattern 20 session target ipv4:172.20.59.93 ! line con 0 transport input none line aux 0 line vty 0 4 login ! end

To display the values configured on the 8-Port RJ-21 FXS module, use the show running-config command, as follows:

    -------------------- gateway# sh running-config Building configuration... Current configuration:1062 bytes ! version 12.1 no service single-slot-reload-enable no service pad service timestamps debug uptime service timestamps log uptime no service password-encryption ! hostname gateway ! no logging buffered no logging buffered logging rate-limit console 10 except errors ! ip subnet-zero no ip finger ! ip audit notify log ip audit po max-events 100 ! voicecard mode toll-by-pass ! interface FastEthernet0/0 ip address 172.20.59.93 255.255.0.0 duplex auto speed auto ! interface GigabitEthernet0/0 ip address 1.1.1.1 255.255.255.0 no negotiation auto ! ip default-gateway 172.20.59.1 ip classless no ip http server ! call rsvp-sync ! voice-port 3/0 ! voice-port 3/1 ! voice-port 4/0 ! voice-port 4/1 ! voice-port 4/2 ! voice-port 4/3 ! voice-port 4/4 ! voice-port 4/5 ! voice-port 4/6 ! voice-port 4/7 ! dial-peer voice 1 pots destination-pattern 20 port 4/0 ! dial-peer voice 2 voip destination-pattern 10 session target ipv4:172.20.59.61 ! gatekeeper shutdown ! line con 0 exec-timeout 0 0 transport input none line vty 0 4 login ! end

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Posted: Thu Dec 19 10:06:06 PST 2002
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