Specifications

4-4
Software Configuration Guide for Cisco 2600 Series, Cisco 3600 Series, and Cisco 3700 Series Routers
OL-1957-03
Chapter 4 Configuring Voice-over-IP
FXS-to-FXS Connection Using RSVP
The following example shows how to configure VoIP for simple FXS-to-FXS connections. In this
example, a very small company, consisting of two offices, has decided to integrate VoIP into its existing
IP network. One basic telephony device is connected to Router RLB-1; therefore Router RLB-1 has been
configured for one POTS peer and one VoIP peer. Router RLB-w and Router R12-e establish the WAN
connection between the two offices. Because one POTS telephony device is connected to Router RLB-2,
it has also been configured for only one POTS peer and one VoIP peer.
In this example, only the calling end (Router RLB-1) is requesting RSVP. Figure 4-1 illustrates the
topology of this FXS-to-FXS connection example.
Figure 4-1 FXS-to-FXS Connection Example
Configuration for Router RLB-1
hostname rlb-1
! Create voip dial-peer 10
dial-peer voice 10 voip
! Define its associated telephone number and IP address
destination-pattern [phone]
sess-target ipv4:40.0.0.1
! Request RSVP
req-qos guaranteedDelay
! Create pots dial-peer 1
dial-peer voice 1 pots
! Define its associated telephone number and voice port
destination-pattern [phone]
port 1/0/0
! Configure serial interface 0/0
interface Serial0/0
ip address 10.0.0.1 255.0.0.0
no ip mroute-cache
! Configure RTP header compression
ip rtp header-compression
ip rtp compression-connections 25
! Enable RSVP on this interface
ip rsvp bandwidth 48 48
fair-queue 64 256 36
clockrate 64000
router igrp 888
network 10.0.0.0
network 20.0.0.0
network 40.0.0.0
Router
RLB-w
Serial port
Router
RLB-1
S6612
Dial peer 1
POTS
Dial peer 2
POTS
64 kbps
64 kbps
1/0 1/3
Serial port
1/3 1/0
Serial port
1/0
Voice port
1/0/0
Voice port
1/0/0
128 kbps
IP cloud
Router
RLB-2
Router
R12-e
Serial port
0/0