[Freeswitch-users] mod_com_g729 transcoding

[Colin Mason]

I have phone A connected to freeswitch box 1 and phone B connected to freeswitch box 2.

Phone A wants to dial phone B using G729. Codec is always G729.
The path RTP follows is:



Phone A -------> FreeSWITCH 1 -------> FreeSWITCH 2 -------> Phone B
                   (g729)                                (g729)                                   (g729)



My question is, why is it that the freeswitch box receiving the call uses up an encoder/decoder when the codec is G729 along the path? If I reverse the call and call Phone A from Phone B, FreeSWITCH Box 1 uses up 1 license.
if I dial the PSTN to a carrier who supports G729, I don't use up a license. Any thoughts? Maybe this is normal.

FreeSWITCH Box 1:
2013-01-10 01:50:14.195277 [DEBUG] sofia_glue.c:3327 AUDIO RTP [sofia/mpls/I888_1 at 172.17.17.17] 172.17.17.17 port 32014 -> 10.253.200.6 port 16466 codec: 18 ms: 20
2013-01-10 01:50:14.195277 [DEBUG] sofia_glue.c:3327 AUDIO RTP [sofia/transport/2996] 172.17.17.17 port 27276 -> 172.16.16.16 port 17056 codec: 18 ms: 20
freeswitch at internal> g729_info
Permitted G729 channels: 40
Encoders in use: 0
Decoders in use: 0

FreeSWITCH Box 2:
2013-01-10 01:50:14.184757 [DEBUG] sofia_glue.c:3351 AUDIO RTP [sofia/transport/3888 at 172.17.17.17] 172.16.16.16 port 17056 -> 172.17.17.17 port 27276 codec: 18 ms: 20
2013-01-10 01:50:15.664733 [DEBUG] sofia_glue.c:3351 AUDIO RTP [sofia/mpls/sip:C996_1 at 10.253.200.10:5060] 172.16.16.16 port 18966 -> 10.253.200.10 port 16486 codec: 18 ms: 20
freeswitch at internal> g729_info
Permitted G729 channels: 40
Encoders in use: 1
Decoders in use: 1



Thanks in advance guys.
Colin
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