Specifications

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Cisco 1751 Router Software Configuration Guide
OL-1070-01
3
VoIP Configuration Examples
This chapter demonstrates how to configure VoIP in four different scenarios. The actual VoIP
configuration procedure depends on the actual topology of your voice network. The following
configuration examples should give you a starting point. These configuration examples would need to
be customized to reflect your network topology.
Configuration procedures are supplied for the following scenarios:
• FXS-to-FXS Connection Using RSVP
• Linking PBX Users with E&M Trunk Lines
• FXO Gateway to PSTN
• FXO Gateway to PSTN (PLAR Mode)
FXS-to-FXS Connection Using RSVP
The following example shows how to configure VoIP for simple FXS-to-FXS connection.
In this example, a very small company with two offices decides to integrate VoIP in its existing IP
network. One basic telephony device is connected to Router RLB-1; therefore, Router RLB-1 is
configured for one POTS dial peer and one VoIP dial peer. Router RLB-w and Router RLB-e establish
the WAN connection between the two offices. Because one POTS telephony device is connected to
Router RLB-2, it is also configured for one POTS dial peer and one VoIP dial peer.
In this example, only the calling end (Router RLB-1) is requesting RSVP.
Figure 1 illustrates the topology of this FXS-to-FXS connection example.