14-3. Voice Modules Catalyst 4000 access gateway Performs as a WAN router, H.323 voice over IP (VoIP) gateway, and an SCCP digital signal processor (DSP) farm for Cisco CallManager. The module also supports these interfaces: - One Gigabit Ethernet 802.1Q trunk into the switch backplane, supporting up to six VLANs - - Two voice/WAN interface cards (VWIC) One or two-port T1 or E1 trunks
- - One voice interface card (VIC) Two-port Foreign Exchange Station (FXS), two-port Foreign Exchange Office (FXO), or two-port ISDN BRI/ST
- - One WAN interface card (WIC) slot One-port 56/64 kbps DSU/CSU, two-port asynchronous/synchronous serial
Catalyst 4000 8-port RJ-21 FXS module VoIP gateway with 8 FXS interfaces for analog phone and fax devices. Catalyst 4224 access gateway switch A combination device containing a 24-port 10/100 Ethernet switch, an 8-port FXS analog telephony module, and 3 slots for multiflex VWICs, VICs, and WICs. Catalyst 6000 8-port voice T1 and services module VoIP gateway to 8 T1 (or E1) ISDN PRI or CAS trunks. Catalyst 6000 24-port FXS module VoIP gateway for 24 analog stations.
Catalyst 4000 and 4224 Access Gateway Configuration 1. | (Catalyst 4000 only) Open a command-line interface (CLI) session with the access gateway module:
COS | session module
| IOS | N/A |
From the switch supervisor CLI, a new Telnet session is opened to the access gateway module. This module uses a router IOS CLI for all configuration and display commands.
| 2. | Configure the access gateway.
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TIP The Catalyst 4000 access gateway module and the Catalyst 4224 access gateway switch both use commands from the Cisco IOS software for routers. Refer to Chapter 12 "Voice and Telephony" in the Cisco Field Manual: Router Configuration, Cisco Press, ISBN 1-58705-024-2, or the Cisco IOS Voice, Video, and Fax Configuration Guide at www.cisco.com/univercd/cc/td/doc/product/software/ios122/122cgcr/fvvfax_c/index.htm for more complete configuration information. In particular, you will configure the access gateway as a router and as an H.323 VoIP gateway. Chapter 12, "Switch Management," contains the necessary information to configure the voice ports, dial peers, H.323 gateways, and the QoS features needed for voice delivery. Survivable Remote Site (SRS) telephony is also covered there. The Catalyst 4000 8-port FXS module must be configured from the access gateway module configuration session. It doesn't have a session interface of its own and can't be configured apart from the access gateway module.
Catalyst 6000 Voice Module Configuration 1. | Identify the configuration servers.
- a. (Optional) Use a DHCP server:
COS | [View full width] set port voice interface mod/port dhcp enable  [vlan vlan]
| IOS | N/A |
The module sends a DHCP request to obtain its own IP address. A DHCP server must also return the TFTP server address, DNS server address, and the default gateway address. For an 8-port T1/E1 module, each port must receive a unique IP address. The 24-port FXS module needs only one IP address for the module.
You can use the vlan keyword to assign the voice gateway port to a specific voice vlan number (1 to 1000 or 1025 to 4094).
TIP To see the MAC address assigned to each voice gateway port or module, use the show port voice command. - b. (Optional) Don't use a DHCP server:
COS | [View full width] set port voice interface mod/port dhcp disable ipaddrspec tftp ipaddr [vlan vlan] [gateway ipaddr] [dns [ipaddr] [domain-name]]
| IOS | N/A |
You can assign each voice gateway port static configuration values, if the use of a DHCP server is not practical or possible. The ipaddrspec field gives the IP address and mask in the form ip-address/mask (dotted-format mask), or ip-address/bits (number of mask bits 0 to 31), or ip-address (mask derived from the network class). For an 8-port T1/E1 module, each port must receive a unique IP address. The 24-port FXS module needs only one IP address for the module.
The tftp keyword identifies the TFTP server address as ipaddr. You can assign the voice gateway port to a specific voice VLAN by using the vlan keyword. The default gateway can be given with the gateway keyword. You can use the dns keyword to identify the DNS server at IP address ipaddr, using the domain domain-name (text string). If either DNS parameter is omitted, the DNS values from the switch supervisor are used. You define these with the set ip dns server and set ip dns domain commands.
| 2. | Configure the voice gateway in Cisco CallManager.
After the module has its IP address and server information, it can download further configuration parameters. The addresses of Cisco CallManager servers are obtained from the TFTP server. The CallManager servers must be configured so that they can control all aspects of the module's operation.
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Example A Catalyst 6000 8-port T1 module is located in slot 2. It is configured to use a DHCP server for ports 2/7 and 2/8. Ports 1 through 6 are statically configured with their IP addresses, masks, TFTP server address 192.168.3.200, and default gateway address 192.168.217.1. All 8 ports are configured to use VLAN 21 as the voice VLAN. Notice that each T1 port requires a unique IP address. Two Catalyst 6000 24-port FXS modules are located in slots 3 and 4. The module in slot 3 uses a DHCP server to obtain its configuration information. The module in slot 4 is statically configured. These modules require only a single IP address for all 24 ports:
Displaying Information About Voice Modules Table 14-3 lists some switch commands that you can use to display helpful information about Catalyst voice gateway modules. Table 14-3. Switch Commands to Display Catalyst Voice Gateway Module InformationDisplay Function | Switch OS | Command |
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Voice port and server configuration | COS | show port voice interface [mod[/port]]
| IOS | N/A | T1/E1 CallManager and DSP status | COS | show port [mod[/port]]
| IOS | N/A | FXS port hook and line status | COS | show port [mod[/port]]
| IOS | N/A | Voice port Facilities Data Link (FDL) error statistics | COS | show port voice fdl [mod[/port]]
| IOS | N/A | T1/E1 port active-call information | COS | [View full width] show port voice active [mod[/port]] [all | call | conference | transcode] [ipaddr]
| IOS | N/A | FXS port active-call information | COS | show port voice active [mod[/port]] call
| IOS | N/A |
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