Configuring The Gsmamr-Nb Codec On The High-Density Packet Vfc - Cisco VGD-1T3 Software Configuration Manual

Configuring and Managing the High-Density Packet Voice Feature Card
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Configuring the GSMAMR-NB Codec on the High-Density Packet VFC

To configure GSMAMR-NB codec support on the High-Density Packet VFC for Cisco VGD 1T3 voice
gateways, perform the following steps.
SUMMARY STEPS
1.
2.
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7.
RFC 3267 allows for the sending of redundant voice frames with the same sequence number and
time stamp. The Cisco VGD 1T3 platforms do not send redundant packets, but they can receive
redundant frames. When redundancy is used, RFC 3267 allows for different compression modes to
be used for redundant frames. The standard recommends that when two redundant frames are
received accurately, the frame with the lower compression (highest bit rate) be used. The
Cisco VGD 1T3 instead uses the frame that is first received.
The following apply to the codec gsmamr-nb command used to configure the GSMAMR-NB
codec:
Cisco VGD 1T3 does not support any of the parameter changes after the call is up.
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Support is provided for both octet-aligned and bandwidth-efficient frame formats.
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Support is provided for all eight modes of AMR-NB codec.
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– The gateway can change to any mode at any time, which translates to mode-change-period of
20 ms and mode-change-neighbor value of 0.
CRC is supported.
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Only supported value for maxptime and ptime arguments is 20 ms.
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– Robust sorting and interleaving are not supported.
The only supported value for the channels argument is 1.
enable
configure terminal
dial-peer voice tag {pots | mmoip | voip}
codec gsmamr-nb [packetization-period 20] [encap rfc3267] [frame-format
{bandwidth-efficient | octet-aligned [crc | no-crc]}] [modes modes-value]
rtp payload-type cisco-codec-gsmamrnb number
exit
end
Configuring the GSMAMR-NB Codec for the High-Density Packet VFC
Cisco VGD 1T3 Voice Gateway Software Configuration Guide
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