Configuring Cisco MC3810 Series Concentrators to Use High-Performance Compression Modules
codec (dial-peer)
9
Cisco IOS Release 12.1(2)T
Command History
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.
Release
Modification
11.3(1)T
This command was introduced as a Cisco 3600 series VoIP dial-peer
configuration command.
12.0(4)T
This command was modified for VoFR dial peers. On the
Cisco MC3810 series, this command was first supported as a dial-peer
command.
12.0(5)XK
The
g729br8
codec and
pre-ietf
keyword were added for the
Cisco 2600 and 3600 series.
12.0(7)T
This command was implemented in the 12.0(7)T release.
12.0(7)XK
The
g729abr8
and
g729ar8
codecs were added for the Cisco MC3810
series and the keyword
pre-ietf
was deleted.
12.1(2)T
This command was implemented in the 12.1(2)T release.
Table 3
Voice Payload-per-Frame Options and Defaults
Codec
Protocol
Voice Payload Options (bytes)
Default Voice
Payload (bytes)
g711alaw
g711ulaw
VoIP
VoFR
VoATM
80, 160
40 to 240 in multiples of 40
40 to 240 in multiples of 40
160
240
240
g723ar53
g723r53
VoIP
VoFR
VoATM
20 to 220 in multiples of 20
20 to 240 in multiples of 20
20 to 240 in multiples of 20
20
20
20
g723ar63
g723r63
VoIP
VoFR
VoATM
24 to 216 in multiples of 24
24 to 240 in multiples of 24
24 to 240 in multiples of 24
24
24
24
g726r16
VoIP
VoFR
VoATM
20 to 220 in multiples of 20
10 to 240 in multiples of 10
10 to 240 in multiples of 10
40
60
60
g726r24
VoIP
VoFR
VoATM
30 to 210 in multiples of 30
15 to 240 in multiples of 15
30 to 240 in multiples of 15
60
90
90
