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Configuring Cisco MC3810 Series Concentrators to Use High-Performance Compression Modules
Release
Command History
11.3(1)T
12.0(4)T
12.0(5)XK
12.0(7)T
12.0(7)XK
12.1(2)T
Usage Guidelines
A codec type can be configured on the dial-peer if it is supported under the codec complexity setting
you have specified.
The dial-peer configuration command is particularly useful when you must change to a
small-bandwidth codec. Large-bandwidth codecs, such as G.711, do not fit in a small-bandwidth link.
However, g711alaw and g711ulaw provide higher-quality voice transmission than other codecs. For
almost toll quality (and a significant savings in bandwidth), g729r8 provides near-toll quality with
considerable bandwidth savings.
If the destination router does not support a codec required by the originating router, the call setup fails.
You can change the payload of each voice packet frame by using the bytes payload-size setting. However,
increasing the payload size can add processing delay for each voice packet. Table 3 describes the voice
payload options and default values for the codecs and packet voice protocols.
Table 3
Codec
g711alaw
g711ulaw
g723ar53
g723r53
g723ar63
g723r63
g726r16
g726r24
Modification
This command was introduced as a Cisco 3600 series VoIP dial-peer
configuration command.
This command was modified for VoFR dial peers. On the
Cisco MC3810 series, this command was first supported as a dial-peer
command.
The g729br8 codec and pre-ietf keyword were added for the
Cisco 2600 and 3600 series.
This command was implemented in the 12.0(7)T release.
The g729abr8 and g729ar8 codecs were added for the Cisco MC3810
series and the keyword pre-ietf was deleted.
This command was implemented in the 12.1(2)T release.
Voice Payload-per-Frame Options and Defaults
Protocol
Voice Payload Options (bytes)
VoIP
80, 160
VoFR
40 to 240 in multiples of 40
VoATM
40 to 240 in multiples of 40
VoIP
20 to 220 in multiples of 20
VoFR
20 to 240 in multiples of 20
VoATM
20 to 240 in multiples of 20
VoIP
24 to 216 in multiples of 24
VoFR
24 to 240 in multiples of 24
VoATM
24 to 240 in multiples of 24
VoIP
20 to 220 in multiples of 20
VoFR
10 to 240 in multiples of 10
VoATM
10 to 240 in multiples of 10
VoIP
30 to 210 in multiples of 30
VoFR
15 to 240 in multiples of 15
VoATM
30 to 240 in multiples of 15
codec (dial-peer)
Default Voice
Payload (bytes)
160
240
240
20
20
20
24
24
24
40
60
60
60
90
90
Cisco IOS Release 12.1(2)T
9
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