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This chapter describes Cisco AccessPath-VS3 Packet Telephony Concentrator configurations needed to enable telephony clients to make VoIP calls.
Topics in this chapter include:
To enable clients to dial in, you configure Integrated Services Digital Network (ISDN) interfaces.
Generally, commands entered in asynchronous interface mode enable you to configure protocol-specific parameters for asynchronous interfaces, whereas commands entered in line configuration mode permit you to configure the physical aspects for the same port. When using the show line command with a VoIP Access Shelf, the tty line corresponds with the asynchronous interface of the same number. For example, tty line 1 corresponds with asynchronous interface 1 and tty line 16 corresponds with asynchronous interface 16.
This section describes how to configure interfaces on the AccessPath-VS3 system VoIP Access Shelves and includes the following sections:
The VoIP Access Shelf uses two loopback interfaces. You assign an IP network number to the loopback interfaces, then let each asynchronous interface borrow this network number.
To configure the loopback interfaces, perform the following steps:
Step 1 Create interface loopback 0:
Step 2 Give the loopback 0 interface an IP address using an existing subnet (such as subnet 172.16.1.0):
Step 3 Create interface loopback 1, which is the logical IP subnet used for configuration and management:
Step 4 Give the loopback 1 interface an IP address using an existing subnet reserved for configuration and management (such as subnet 192.168.1.0):
When you configure the T1 controller, two corresponding D-channel serial interfaces are instantly created. Serial interface 0:23 is the D channel for the T0 controller, and serial interface 1:23 is the D channel for the T1 controller. You must configure each serial interface to receive incoming and send outgoing modem signaling.
To configure the ISDN D-channel serial interfaces, follow these steps:
Step 1 Specify the D channel of the first Primary Rate Interface (PRI):
Step 2 Configure all incoming voice calls to go to the voice DSPs:
Step 3 Specify the D channel for the second PRI and give it the same channel configurations you set for the first PRI interface:
This section describes how to configure the T1 and E1 controllers and includes the following sections:
To configure the T1 controllers (T1/0 through T1/3), which accept and send incoming and outgoing calls through ISDN PRI interfaces, follow these steps:
Step 1 Enable the T0 controller:
Step 2 Set the framing and line code type. The framing and line code you configure must match your telco's offering, which in most cases is esf and b8zs.
Step 3 Configure one T1 line to serve as the primary or most stable clock source line. (The other T1 line is configured as the secondary clock source line, described later in this procedure.)
Most T1 lines provide stable clocking, so choosing the correct primary and secondary clock source is not a vital part of the configuration. However, do not configure the clock source as internal unless you are performing back-to-back advanced testing between two routers in a simulated network environment such as in a router lab.
Step 4 Specify how you want to configure all 24 channels. To configure all channels for ISDN, enter the following commands:
If you are not running ISDN but want to configure a channelized T1 to accept voice calls, substitute the pri-group timeslots 1-24 command with the cas-group 1 timeslots 1-24 command on both T1 controllers. This command configures the E&M (ear and mouth) signaling on each timeslot.
Alternatively you can configure a channelized T1 that is not running ISDN with the channel-group 1 timeslots 1-24 command on both T1 controllers:
Step 5 Set the facilities data link exchange standard for the channel service unit (CSU) on the VoIP Access Shelf's T1 controllers by entering the fdl controller interface command. You must configure this command on both T1 controllers if you want to support the CSU functionality. However, you must use the same facilities data link exchange standard as your service provider.
Step 6 Configure the T1 controller. This controller's configuration is identical to the one you entered on the T0 controller except that it is used as the secondary clock source line.
To configure the E1 controllers, which accept and send incoming and outgoing calls through ISDN PRI interfaces, perform the following steps:
Step 1 Enter global configuration mode and enter configuration commands from the console:
# configure terminalEnter configuration commands, one per line. End with CNTL/Z.(config)#Step 2 Enter the European telco switch type:
Step 3 Enter controller configuration mode to configure an E1 controller port. The E1 controller ports are 0 and 1. The ports are labeled on the quad E1 PRI card.
or
(config)# controller E1 1(config-controller)#Step 4 Enter the framing type for the E1 line. The framing type must match your telco's offering.
(config-controller)# framing crc4(config-controller)#Step 5 Enter the line code type for the E1 line. The line code must match your telco's offering.
(config-controller)# linecode hdb3(config-controller)#Step 6 Enter the clock source for the E1 line. Configure one E1 line to serve as the primary or most stable clock source line. The other E1 line is configured as the secondary clock source line.
(config-controller)# clock source line primaryor
(config-controller)# clock source line secondaryStep 7 Enter how you want to configure all 31 channels:
(config-controller)# pri-group timeslots 1-31(config-controller)#Step 8 Exit controller configuration mode:
The resulting configuration configures E1 controllers to function with E1 PRI lines.
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