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Optimizing Dial Peer and Network Interface Configurations

Release 12.0(7)XK

The default for the codec command is g729r8; normally the default conﬁguration for this command

is the most desirable. If, however, 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 will result in better voice quality, but it will also require higher bandwidth requirements

for voice.

For example, to specify a codec rate of G.711a-law for VoIP dial peer 108, enter the following:

dial-peer voice 108 voip

destination-pattern +14085551234

codec g711alaw

session target ipv4:10.0.0.8

Conﬁguring VAD for a VoIP Dial Peer

To disable the transmission of silence packets for a selected VoIP peer, use the following commands

beginning in global conﬁguration mode:

The default for the vad command is enabled; normally the default conﬁguration for this command

is the most desirable. If you are operating on a high bandwidth network and voice quality is of the

highest importance, you should disable vad. Using this value will result in better voice quality, but

it will also require higher bandwidth requirements for voice.

For example, to enable VAD for VoIP dial peer 108, enter the following:

dial-peer voice 108 voip

destination-pattern +14085551234

vad

session target ipv4:10.0.0.8

Conﬁguring Codec Selection Order

To conﬁgure codec selection order, perform the following tasks:

• Conﬁguring a Voice Class to Deﬁne Codec Selection Order

• Applying a Voice Class for Codec Selection to a VoIP Dial Peer

Conﬁguring a Voice Class to Deﬁne Codec Selection Order

You can deﬁne a voice class in which you conﬁgure a selection order for codecs, and then map the

voice class to a VoIP dial peer.

2 router(config-dialpeer)# codec {g711alaw |

g711ulaw | g723ar53 | g723ar63 | g723r53 |

g723r63 | g726r16 | g726r24 | g726r32 | g728 |

g729abr8 | g729ar8 | g729br8 | g729r8}[bytes

payload-size

]

Specify the desired voice coder rate of speech.Optionally specify

the voice payload (in bytes) of each frame.

Step Command Purpose

router(config)# dial-peer voice

number

voip

Enter dial-peer conﬁguration mode to conﬁgure a VoIP peer.

router(config)# vad

Disable the transmission of silence packets (enabling VAD).

Step Command Purpose

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