Hi Mike, thx. Today we had some failing test fax sessions (g711/PCMA) and my first thought was that it could be caused by FS during transcoding. So I looked into FS logfile and found those hints about transcoding. But ringback shouldn't be the problem. Fax path was from FAX device (source) through a voip cpe, through a SBC through a SS7 PSTN device into PSTN. Then from PSTN through AVAYA PBX trough sangoma A104d into freeswitch. From there RTP goes to a Cisco ATA to be converted to TDM and consumed by a FAX device (Target). So we have a lot of points to look at ... regrads Helmut
Your playing a tone, we need to encode that tone into the codec of the channel. You could make it stop transcoding by not providing ringback but we are still doing some transcoding for the tone detection in openzap that you won't see via log messages. Why is this transcoding a problem?
Mike
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