[asterisk-users] txfax not working with spandsp

[David Boyd]

On Fri, 2007-12-21 at 18:41 +0800, Dinesh Nair wrote:
> the attached log with verbose=6 and debug=6 refers.
> 
> we've got a sangoma A104 (no hwec) with PRI ports 1 & 3 loopbacked to each
> other. we're trying to have txfax send out on one of those pri ports with
> rxfax listening on the other side, hence having asterisk send a fax to
> itself. we however have bad, and i mean really bad (<10%) success rates.
> 
> we're currently using asterisk 1.2.24 with spandsp 0.0.4-20071214
> (snapshot of 14/12/07) and we keep getting "Fax send not successful -
> result (25) No response after sending a page." errors. ECM is turned on in
> both app_txfax.c and app_rxfax.c.
> 
> from what we gather just reading the code, time T4 expires in txfax because
> apparently rxfax is not sending a response back out, and thus after the
> maximum message retries (3) txfax just drops the call, leading rxfax to
> say that the call was dropped prematurely.
> 
> does anyone know what's going on here, and if there is a version of
> spandsp which could work in this scenario ?
> 
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Do you have any timing issues such as slips or bi-polar violations
taking place. It sounds like there are dropped packets or something.

dave