[Freeswitch-users] OpenZAP codec Question: Why L16 at 8000 codec for incoming calls

[Helmut Kuper]

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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