Cisco ATA186 CODEC selection

Problem:

How to modify the ATAs CODEC settings.

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Solution:

RxCodec Description
Use this parameter to specify receiving-audio codec preference. The following values are valid:

0 G.723 (can be selected only if LBRCodec is set to 0)
1 G.711A-law
2 G.711΅-law
3 G.729a (can be selected only if LBRCodec is set to 3)
6 G.726-32kbps
Value Type Integer Range 0-3, 6
Default 2

TxCodec Description
Use this parameter to specify the transmitting-audio codec preference. The following values are valid:

0 G.723 (can be selected only if LBRCodec is set to 0)
1 G.711A-law
2 G.711΅-law
3 G.729A (can be selected only if LBRCodec is set to 3
6 G.726-32kbps
Value Type Integer Range 0-3, 6
Default 2

LBRCodec Description
This parameter allows you to specify which low-bit-rate codecs are available. The Cisco ATA is capable of supporting two G.723.1 connections, two G.726 connections, or one G.729 connection.
When G.723.1 is selected as the low-bit-rate codec, each FXS port is allocated with one G.723.1 connection.
When G.729 is selected, only one FXS port is capable of operating with the G.729 codec. The allocation of the G.729 resource to the FXS port is dynamic. The G.729 resource, if available, is allocated to an FXS port when a call is initiated or received; the resource is released when a call is completed.
When G.726 is selected, the Cisco ATA can support as many as two active simultaneous G.726 connections. The allocation of the G.726 codec is dynamic. Two G.726 connections can be used by one Cisco ATA voice port for conferencing or shared by two Cisco ATA voice ports.

The following values are valid:

0 G.723.1 as the low-bit-rate codec.
3 G.729 as the low-bit-rate codec.
6 G.726-32kbps as the low-bit-rate codec.
Value Type Integer Range 0, 3 or 6
Default 0


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