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This chapter provides a sample configuration file for linking PBX users to a T1 ISDN PRI interface using Voice over IP. This configuration example should give you a starting point in your configuration process. The actual Voice over IP configuration procedure you complete depends on the topology of your voice network. This configuration example needs to be customized to reflect your network topology.
This example describes how to configure Voice over IP to link PBX users with T1 channels configured for ISDN PRI signaling. In this example, the company has already established a working IP connection between its two remote offices, one in San Jose and the other in Research Triangle Park (RTP), North Carolina. Figure 2-1 illustrates the topology of this example.
Each office has an internal telephone network using PBX, connected to the voice network by T1 interfaces. The San Jose office, located to the left of the IP cloud, has two T1 connections; the RTP office, located to the right of the IP cloud, has only one. Both offices are using PRI signaling for the T1 connections.
To reach a destination in RTP, users in San Jose pick up the handset, hear a primary dial tone, then dial 9, 422, and the destination extension number. To reach a destination in San Jose, users in RTP pick up the handset, hear a primary dial tone, then dial 4. After dialing 4, users hear a secondary dial tone. Depending on the destination, users then dial 525, 526, or 527, and the extension number.
The first part of this configuration example defines dial-in access, including configuring the T1 lines and the ISDN D-channel parameters. For more information about configuring ISDN PRI, refer to the "Configuring Channelized E1 and Channelized T1" chapter in the Cisco IOS Release 11.3 Dial Solutions Configuration Guide.
hostname sanjose ! ! Define the telephone company's switch type isdn switch-type primary-5ess ! ! Configure T1 PRI for line 1 controller T1 1/0/0 framing esf clock source line primary linecode b8zs pri-group timeslots 1-24 ! ! Configure T1 PRI for line 2 controller T1 1/0/1 framing esf clock source line secondary linecode b8zs pri-group timeslots 1-24 ! ! Configure the ISDN D channel for each ISDN PRI line ! Serial interface 1/0/0:23 is the D channel for controller T1 0 ! interface Serial1/0/0:23 isdn incoming-voice modem ! ! Serial interface 1/0/1:23 is the D channel for controller T1 1 interface Serial1/0/1:23 isdn incoming-voice modem
The next part of this example configures number expansion:
! Configure number expansion. num-exp 52..... 140852..... num-exp 422.... 1729422....
The next part of this example configures the POTS and VoIP dial peers:
! Configure pots dial-peer 1 using the first T1 dial-peer voice 1 pots prefix 6 dest-pat 1408526.... port 1/0/0:D ! ! Configure pots dial-peer 2 using the first T1 dial-peer voice 2 pots prefix 7 dest-pat 1408527.... port 1/0/0:D ! ! Configure pots dial-peer 3 using the second T1 dial-peer voice 3 pots prefix 5 dest-pat 1408525.... port 1/0/1:D ! ! Configure voip dial-peer 4 dial-peer voice 4 voip dest-pat 1729422.... session-target ipv4:10.1.1.2
The first part of this configuration example defines dial-in access, including configuring the T1 line and the ISDN D-channel parameters. For more information about configuring ISDN PRI, refer to the "Configuring Channelized E1 and Channelized T1" chapter in the Cisco IOS Release 11.3 Dial Solutions Configuration Guide.
hostname rtp ! Define the telephone company's switch type isdn switch-type primary-5ess ! Configure T1 PRI for line 1 controller T1 1/0/0 framing esf clock source line primary linecode b8zs pri-group timeslots 1-24 ! ! Configure the ISDN D channel for ISDN PRI line 1 ! Serial interface 0:23 is the D channel for controller T1 0 interface Serial1/0/0:23 ip address 7.1.1.10 255.255.255.0 encapsulation ppp isdn incoming-voice modem dialer-group 1 ppp authentication chap
The next part of this example configures number expansion:
! Configure number expansion. num-exp 52..... 140852..... num-exp 422.... 1729422....
The next part of this configuration example defines the POTS and VoIP peers:
! Configure pots dial-peer 1 dial-peer voice 1 pots dest-pat 1729422.... port 1/0/0:D ! ! Configure voice-network dial-peer 5 dial-peer voice 4 voip dest-pat 140852..... session-target ipv4:10.1.1.1
Posted: Wed Nov 3 16:56:40 PST 1999
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