Specifications

Chapter 7 - Port Configuration Administration Manual (SIP/MGCP Version)
AT-VP504E FXS 59
Selecting the Pre-
ferred Codec
The AT-VP504E FXS supports various codecs for transmitting audio or
data signals.You must set and enable these codecs for each port.
To select a codec:
1. Locate the port1DspPreferredCodec variable (under
port1DspCodecGrou p).
This variable sets the preferred codec for this port.
2. Select one of the available configurations:
• 0= G.711 u-Law (PCMU)
• 1 = G.711 a-Law (PCMA)
• 2 = G.723.1
• 3 = G.729.AB
The default value is 0 = G.711 u-Law.
Enabling
Individual
Codecs
Codecs are enabled by setting the variable to 1 =Enable. The following
codec variables are available:
port1DspCodecG711aLawEnable
port1DspCodecG711uLawEnable
port1DspCodecG7231Enable
port1DspCodecG729ABEnable
port1DspCodecT38Enable
Table 27 lists other codec options that can be set.
Table 27: Other Codec Options
Variable Definition Values
port1DspCodecG711aLawPTimeMax Maximum Packetization time in ms. 10-80
port1DspCodecG711uLawPTimeMax Maximum Packetization time in ms. 10-80
port1DspCodecG7231PTimeMax Maximum Packetization time in ms. 30
port1DspCodecG729APTimeMax Maximum Packetization time in ms. 20-40
port1DspCodecG711aLawPTimeMin Minimum Packetization time in ms. 10-80
port1DspCodecG711uLawPTimeMin Minimum Packetization time in ms. 10-80
port1DspCodecG7231PTimeMin Minimum Packetization time in ms. 30