Avaya IP Line User Manual download pdf (Page 180)

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Page 180 of 770 Codecs

553-3001-365 Standard 3.00 September 2004

For instance, an IP Phone-to-IP Phone call in the same zone within a LAN can

be set up using G.711 at 64 Kbps. For an IP Phone-to-IP Phone call over a

WAN, the call can be set up using G.729A or G.729AB at 8 Kbps. These data

rates and the Voice Gateway Channel Server on the Voice Gateway Media

Card are for the voice stream only. Packet overhead is not included.

Pre-defined codec table

The Line Terminal Proxy Server (LTPS) and the Voice Gateway Channel

Server on the Voice Gateway Media Card have a pre-defined table of codec

option sets that can be supported.

The first entry in the table has the highest quality audio (BQ = Best Quality)

and requires the largest amount of bandwidth. The last entry requires the least

amount of bandwidth (BB = Best Bandwidth) with lower voice quality.

When the Call Server sets up a Call Server connection between an IP

Phone-to-IP Phone or IP Phone-to-Voice Gateway Channel Server, the

pre-defined table determines which codec it selects for that connection. This

information is provided to the system as part of the IP Phone registration

sequence.

For more information about the registration sequence, refer to “Configuring

the DHCP Server” in Data Networking for Voice over IP (553-3001-160).

Codec selection

The systems use this information to set up a speech path and select a codec

that both endpoints support. As part of zone management, the system further

selects the codec based on whether it is trying to optimize quality (BQ) or

bandwidth usage (BB).

CAUTION

When voice compression codecs are used, voice quality

is impaired if end-to-end calls include multiple

compressions.

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Avaya IP Line User Manual Page 180

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