Specifications

Optimize Dial Peer and Network Interface Configurations
Voice over IP for the Cisco AS5300 35
If there is no called number information provided within the call setup, call classification is handled
as follows:
If there is a modem available in the system-default modem pool
handle the call by a modem from this pool.
Else handle the call as a voice call (either ise the voice dial peer assigned to the
interface over which the call has arrived or use the default dial peer 0).
To identify the service type of a call to be voice, use the following commands beginning in global
configuration mode:
Optimize Dial Peer and Network Interface Configurations
Depending on how you have configured your network interfaces, you might need to configure
additional VoIP dial peer parameters. This section describes the following topics:
• Configure IP Precedence for Dial Peers
• Configure RSVP for Dial Peers
• Configure CODEC and VAD for Dial Peers
Configure IP Precedence for Dial Peers
If you want to give real-time voice traffic a higher priority than other network traffic, you can weight
the voice data traffic associated with a particular VoIP dial peer by using IP Precedence. IP
Precedence scales better than RSVP but provides no admission control.
To give real-time voice traffic precedence over other IP network traffic, use the following commands
beginning in global configuration mode:
In IP Precedence, the numbers 1 through 5 identify classes for IP flows; the numbers 6 and 7 are used
for network and backbone routing and updates.
For example, to ensure that voice traffic associated with VoIP dial peer 103 is given a higher priority
than other IP network traffic, enter the following:
dial-peer voice 103 voip
ip precedence 5
In this example, when an IP call leg is associated with VoIP dial peer 103, all packets transmitted to
the IP network via this dial peer will have their precedence bits set to 5. If the networks receiving
these packets have been configured to recognize precedence bits, the packets will be given priority
over packets with a lower configured precedence value.
Step Command Purpose
1 dial-peer voice number pots Enters the dial peer configuration mode to
configure a POTS peer.
2 incoming called-number number Specifies direct inward dial for this POTS peer.
Step Command Purpose
1 dial-peer voice number voip Enter the dial peer configuration mode to configure
a VoIP peer.
2 ip precedence number Select a precedence level for the voice traffic
associated with that dial peer.