RTP Bridge User’s Guide
19(36)
Doc. No. 1412-1-SAA-1020-1
www.odints.com
Rev. 1.9
Copyright © Odin TeleSystems Inc., 2010
6
Transcoding Operation
Odin provides boards with pre-installed and pre-configured vocoders. They are also
available with the OTX XDM SDK.
The RTP Bridge supports the transcoding operation (data converting from one codec to
another as softswitch) by the following scheme:
CodecA -> linear PCM16 -> CodecB.
The RTP Bridge allows to implement transcoding operation of the following codecs:
G.711 (a-law, u-law) / G.711.1 / G.711.2
G.723
G.726
G.729
GSM-FR
G.722 / G.722.1 / G.722.2 (AMR-WB).
Note that it is possible any combination between these codecs as in RTP channels so in
TDM channels.
The transcoding operations are offloaded to powerful C64+ DSP core (4700 MIPS) of the
TI DM64XX SoC processors without increasing the load of ARM core. So the total
number of transcoding channels can be determined by resource-intensiveness of encoding
/ decoding algorithms in accordance with the selected pair of codecs. Below are the
benchmark results to judge the availability and number of channels and CPU. (See Table
2, Table 3)