Multiservice Networking, IPX Networking, and Security - CCIE Routing and Switching Exam Certification Guide - page 547

Packet Voice Example Figure 12-1

8-1234

Router B
10.10.10.1

FXS

PSTN

8-4567

6-1234

FXS

7-1234

Router A
10.1.1.1

6-4567

FXS

WAN

Router C
10.20.20.1

7-4567

The dial plan for Router A from Figure 12-1 is shown in Table 12-1.

Table 12-1

Dial Plan for Router A

Phone Number Destination

Calls to 8xxxx Forward to IP: 10.10.10.1

Calls to 7xxxx Forward to IP: 10.20.20.1

Outside calls Forward to PSTN

6-1234 Voice FXS port 1/1

6-4567 Voice FXS port 1/2

Router A is configured for VoIP, as shown in Example 12-1. Dial peers are created and they map
dialed digits to a destination. Dial peer 6000 maps digits 61234 to the FXS port 1/1. Dial peer
6001 maps digits 64567 to port 1/2. Dial peers 8000 and 8001 configure VoIP destinations. Dial
peer 8000 maps digit 8 followed by any 4 digits to the IP destination 10.10.10.1 and sets the IP
precedence bits to 101 for VoIP packets. Dial peer 8001 maps digit 7 followed by any 4 digits
to the IP destination 10.20.20.1 and sets the VoIP packet's IP precedence bits to 101.
Compressed RTP is also configured on the serial interface.

Example 12-1 VoIP Configuration Example

dial-peer voice 6000 pots
destination-pattern 61234
port 1/1
!
dial-peer voice 6001 pots
destination-pattern 64567
port 1/2

continues