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Cisco ATA 186 and Cisco ATA 188 Analog Telephone Adaptor Administrator’s Guide for MGCP (version 3.0)
OL-4803-01
Chapter 5 Parameters and Defaults
MGCP Configuration Parameters
PrfCodec
Description
This parameter specifies the default preferred codec. The preferred codec is used only when the Call
Agent does not provide a list of preferred codecs in the Local Connection Options 'a' parameter and when
the remote party does not include a codec preference in its SDP.
The following values are valid:
0=G.723.1 (only if LBRCodec=0)
1=G.711A-law
2=G.711u-law
3=G.729a (only if LBRCodec=3)
Value Type
Integer
Range
0 to 3
Default
1
Voice Configuration Menu Access Code
36
LBRCodec
Description
This parameter is used for selecting the low-bit-rate codec. The following values are valid:
• 0—Select G.723.1 as the low-bit-rate codec (available only for connections 0 and 2).
• 3—Select G.729A as the low-bit-rate codec (available only for connection 0).
If LBRCodec=0, then both Cisco ATA FXS ports can operate with the following codecs:
• Number of codecs=3
• Codec[0]=G.711µ -law
• Codec[1]=G.711A-law
• Codec[2]=G.723.1
If LBRCodec=3, check the setting of bit 21 in the ConnectMode parameter (see the “ConnectMode”
section on page 5-24) to determine if G.729 is enabled for the Phone 1 or Phone 2 FXS port.
If LBRCodec=3, then the Phone 1 FXS port can operate with the following codecs:
• Number of codecs=4
• Codec[0]=G.711µ-law
• Codec[1]=G.711A-law