[asterisk-users] 1.6.1 app_fax: WARNING T.30 ECM carrier not found ??

[David Backeberg]

On Mon, May 4, 2009 at 10:52 PM, sean darcy <seandarcy2 at gmail.com> wrote:
> Receiving a fax with 1.6.1:
>
>   == Spawn extension (incoming-pstn-line, fax, 1) exited non-zero on
> 'DAHDI/4-1'
>     -- Executing [fax at incoming-pstn-line:1] NoOp("DAHDI/4-1", "Fax
> Detected") in new stack
>     -- Executing [fax at incoming-pstn-line:2] Goto("DAHDI/4-1",
> "incoming-fax,s,1") in new stack
>     -- Goto (incoming-fax,s,1)
>     -- Executing [s at incoming-fax:1] Set("DAHDI/4-1",
> "FAXFILE=/var/spool/asterisk/fax/20090504_1602-0") in new stack
>     -- Executing [s at incoming-fax:2] ReceiveFAX("DAHDI/4-1",
> "/var/spool/asterisk/fax/20090504_1602-0.tif") in new stack
>     -- Starting simple switch on 'DAHDI/1-1'
>     -- Remote UNIX connection
>     -- Hungup 'DAHDI/1-1'
> [2009-05-04 16:02:39] WARNING[12989]: app_fax.c:128 span_message:
> WARNING T.30 ECM carrier not found
> [2009-05-04 16:02:40] WARNING[12989]: app_fax.c:128 span_message:
> WARNING T.30 ECM carrier not found
> [2009-05-04 16:02:40] WARNING[12989]: app_fax.c:128 span_message:
> WARNING T.30 ECM carrier not found
> [2009-05-04 16:02:46] WARNING[12989]: app_fax.c:128 span_message:
> WARNING T.30 ECM carrier not found
> [2009-05-04 16:02:46] WARNING[12989]: app_fax.c:128 span_message:
> WARNING T.30 ECM carrier not found
>     -- Executing [s at incoming-fax:3] Hangup("DAHDI/4-1", "") in new stack
>
> ECM - error correction mode ( right?) - but the fax is received OK. Any
> reason to worry? Anything to do?

Since you are receiving a fax over an analog line, you can set up
MixMonitor() or Monitor() to record the fax, play it back, listen for
line noise or static or something else that may be happening that's
throwing those warnings from SpanDSP.
Obviously if you're getting a fax you're not as worried as if this
caused the fax to drop. Once you have a recording of the transmission
and the logs of what happens you can submit it to the SpanDSP project
to see what they think.

Incidentally, how verbose do you have to set your CLI to get output
that lists the warnings?