Specifications

xxiii
Cisco 1751 Router Software Configuration Guide
OL-1070-01
To generate a Simple Network Management Protocol (SNMP), use the following commands beginning
in global configuration mode:
Note RSVP reservations are one-way only. If you configure RSVP, the VoIP dial peers on either
side of the connection must be configured for RSVP.
Configure CODEC and VAD for Dial Peers
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. Voice activity
detection (VAD) is used to disable the transmission of silence packets. CODEC and VAD values for a
dial peer determine how much bandwidth the voice session uses.
Configure CODEC for a VoIP Dial Peer
To specify a voice coder rate for a selected VoIP dial peer, use the following commands, beginning in
global configuration mode:
The default for the codec command is g729r8; normally, the default configuration for this command is
the most desirable. However, if you are operating on a high bandwidth network and voice quality is of
the highest importance, you should configure the codec command for g711alaw or ulaw. Using this
value results in better voice quality, but it also requires higher bandwidth requirements for voice.
For example, to specify a CODEC rate of g711alaw for VoIP dial peer 108, enter the following:
Router(config)# dial-peer voice 108 voip
Router(config-dial-peer)# codec g711alaw
Command Task
Step 1
dial-peer voice number voip Enter the dial peer configuration mode to configure a VoIP dial
peer.
Step 2
acc-qos [best-effort |
controlled-load |
guaranteed-delay]
Generate an SNMP event if the QoS for a dial peer drops below a
specified level.
Command Task
Step 1
dial-peer voice number voip Enter the dial peer configuration mode to
configure a VoIP dial peer.
Step 2
codec [g711alaw | g711ulaw |
g729r8 | g729r8 | ...]
Specify the desired voice coder rate of
speech.