[Freeswitch-users] FAX issues/questions

[Brian West]

On Wed, Nov 16, 2016 at 5:07 PM, Alexandru Covalschi <568691 at gmail.com>
wrote:

> Hello list,
>
> In my set up Freeswitch acts as fax originator, so an image is being
> processed and sent by FS. I do not receive any fax, so all my
> questions/issues are related to sending it. All fax is over IP.
>
> First a question - how to understand if Freeswitch is sending in T.38? Why
> do I always see T.30 FLOW in log even if in SDP is mentioned T.38? I do see
> some "T.38 rxfax set to 0/txfax set to N", I understand that rx is receive
> and tx is transmit, but why any other log strings shows T.30 FLOW?
>

Because its still T.30, you're just encapsulating it .


>
> And the issue - sometimes when I initiate fax I get
> -----------------
> Codec RAW Signed Linear (16 bit) encoder error
> mod_g729.c:102 This codec is only usable in passthrough mode!
>
-----------------
> I can't understand why it's happening as it occurs from time to time, but
> it always happens before Freeswitch makes re-invite to initiate a T.38
> session.
> I suppose that's because I have no license for g729, but the supplier side
> negotiates it before FS has chance to re-invite. But why does it work with
> same SDP in other times?
> Does it have sense to exclude g729 for the initial codec negotiation, or
> g729 is essential to keep T.38 working? What shall I do in case of Asia
> where everything is on g729,? Maybe it has sense to purchase a license -
> but why then it works unstable right now, I mean, why does it even work if
> it requires mod_g729_com? Or it doesn't? I'm really confused on all that.
>


You'll need the codec to negotiate and process the audio before the t.38
re-invite, I do not believe there are any other ways to do this.


>
>
> Thanks in advance!
>
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-- 

*Brian West*
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