Specifications
Configuration Tasks
36
Cisco IOS Release 12.0(3)T
Configure RSVP for Dial Peers
If you have configured your WAN or LAN interfaces for RSVP, you must configure the QoS for any
associated VoIP peers. To configure QoS for a selected VoIP peer, use the following commands
beginning in global configuration mode:
Note Cisco suggests that you select controlled-load for the requested quality of service.
For example, to specify guaranteed delay QoS for VoIP dial peer 108, enter the following:
Dial-peer voice 108 voip
destination-pattern +1408528
req-qos controlled-load
session target ipv4:10.0.0.8
In this example, every time a connection is made through VoIP dial peer 108, an RSVP reservation
request is made between the local router, all intermediate routers in the path, and the final destination
router.
To generate an SNMP trap message if the reserved QoS is less than the configured value for a
selected VoIP peer, use the following commands beginning in the global configuration mode:
Note RSVP reservations are only one-way. If you configure RSVP, the VoIP dial peers on both ends
of the connection must be configured for RSVP.
Configure CODEC and VAD for Dial Peers
Coder-decoder (CODEC) and voice activity detection (VAD) for a dial peer determine how much
bandwidth the voice session uses. CODEC typically is used to transform analog signals into a digital
bit stream and digital signals back into analog signals—in this case, it specifies the voice coder rate
of speech for a dial peer. VAD is used to disable the transmission of silence packets.
Step Command Purpose
1 dial-peer voice number voip Enters the dial peer configuration mode
to configure a VoIP peer.
2 req-qos [best-effort | controlled-load | guaranteed-delay] Specifies the desired quality of service to
be used.
Step Command Purpose
1 dial-peer voice number voip Enters the dial peer configuration
mode to configure a VoIP peer.
2 acc-qos [best-effort | controlled-load | guaranteed-delay] Specifies the QoS value below
which an SNMP trap will be
generated.