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Introduction
Packet Voice Processor Commands Manual
1.4.1 Voice Codecs and Transcoding
Each Packet Voice Processor shelf supports transcoding of up to 16,000 channels
(over 50,000 transcoding sessions per telco rack) with very low transcoding delay.
By deploying the Packet Voice Processor at the network border, providers can
support a wide array of codecs from the customer premise or network edge and
choose to normalize the incoming codec types before transmission to the IP
backbone. This may also eliminate the need to perform transcoding at VoIP service
points such as conferencing servers, media servers, and newer voice portal servers.
Service providers can also use the Packet Voice Processor to assign particular
codec treatment for specific calls based upon route, customer, or defined service
policy. With the Packet Voice Processor operating as a centralized transcoding
resource at the IP network border, providers avoid the expense of low-density
solutions offered by border controllers, media servers, and media gateways.
The Packet Voice Processor performs voice decoding and encoding in conjunction
with voice quality enhancement (using the VQA and IPR technologies), and voice
quality monitoring features.
lists the codecs currently supported by the
Packet Voice Processor.
Note
On G.723 related CODECs, 60 mS P-times should be avoided. Although the CLI
allows selecting 60 mS P-time options on the G.723 CODEC, unreliable performance
and rare crashes has been observed if a high majority of the calls employ this
Table 1-2 PVP Supported Codecs
Codec
Codec Types
G.711
G711A-law
G711 µ-law
G.729
G729
G729A
G729B
G729AB
G.723
G7231
G723_1A_63
G723_1_53
G723_1A_53
G.726
G726_40
G726_32
G726_24
G726_16
G726_40_AAL2
G726_32_AAL2
G726_24_AAL2
G726_16_AAL2
EVRC
EVRC Rev 0
iLBC
iLBC
