Ip Codec Set - Avaya Communication Manager Administrator's Manual
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Screen Reference
IP Codec Set
IP Codec Set
The IP Codec Set screen allows you to specify the type of codec used for voice encoding and
companding (compression/decompression). The main difference between codecs is in the compression
algorithm used; some codecs compress the voice data more than others. A greater degree of compression
results in lower bandwidth requirements on the network, but may also introduce transmission delays and
lower voice quality. Codecs are used for VoIP links between any two VoIP resources or endpoints, e.g., IP
Phone to IP Phone, IP Phone to Media Gateway, Media Gateway to Media Gateway, etc.
The default codec is set for G711MU. The G711MU provides the highest voice quality because it does
the least amount of compression, but it uses the most bandwidth. The G711MU default setting can be
changed to one of two other codecs (and their "flavors") if the G711MU does not meet your desired
voice-quality/bandwidth trade-off specification. For example, if a far-end server is not running Avaya
Communication Manager, you may need to change the codec to match one that is supported by that
server's software.
The order in which the codecs are listed on this screen is the order of preference of usage. A trunk call
between any two VoIP resources or endpoints will be set up to use the first common codec listed.
This screen allows you to define the allowed codecs and packet sizes used between VoIP resources. You
can also enable silence suppression on a per-codec basis. This screen will dynamically display the packet
size in milliseconds for each codec in the set, based on the number of frames you administer per packet.
Figure 210: IP Codec Set screen
change ip-codec-set 1
Codec Set: 1
Audio
Codec
1: G.711MU_______
2:_______________
3:_______________
4:_______________
5:_______________
6:_______________
7:_______________
Media Encryption: none
928
IP Codec Set
Silence
Frames
Suppression
Per Pkt
y
3
_
_
_
_
_
_
_
_
_
_
_
_
Administrator's Guide for Avaya Communication Manager
Packet
Size (ms)
30
Page 1 of 1
November 2003
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