Ip Codec Set - Avaya Communication Manager Administrator's Manual

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
might also introduce transmission delays and lower voice quality. Codecs are used for VoIP
links between any two VoIP resources or endpoints, e.g., IP telephone to IP telephone, IP
telephone 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 might need to change the codec to
match one that is supported by that server's software.
Field descriptions for page 1
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.
IP Codec Set
Issue 2.1 May 2006 1129