[asterisk-dev] Fax with Asterisk and T38Modem

[Wolfgang Pichler]

Hi,

i have already used t38modem with asterisk 1.8.3 with the problems you
have described...

But i did have had another problem - i was not able to somehow pass
the sender information onto asterisk. I wanted to get the hylafax
username which has originated the fax to asterisk - to be able to set
the correct outgoing callerid - but didn't manage this.

Have you already got this working ?

br,
Wolfgang

2011/6/29 Thorolf Godawa <nospam at godawa.de>:
> Hi,
>
> I'm fighting with HylaFAX, Asterisk and T38Modem since some time, to get
> fax2mail and mail2fax working, my SIP-provider only supports T38 and
> thus using G711 with IAXModem is not an option.
>
>
> I have got running mail2fax with HylaFAX+ 5.5.0, Asterisk 1.4.20 and
> T38Modem 2.0.0 successfull, but I'm not able to upgrade to anything
> newer than Asterisk 1.4.24.
>
> I was able to track down this problem to some changes in the chan_sip.c,
> where a "improved support for T38 on initial INVITE" has been
> implemented, see:
> <https://reviewboard.asterisk.org/r/208/diff/#index_header>
>
> I'm not sure what the problem is, but it seems that the T38 handshake
> does not work correct any more bacause the CFR (confirm to receive) is
> missing.
>
> Goal is, to get running this with the latest Asterisk, right now
> 1.8.4.4. Is there s.b. who can give me a hint how to solve the problem?
>
>
> For fax2mail I use Asterisk 1.8.4.4, but it is not working too, after a
> fax call, the connection with T38Modem is established, HylaFAX reports
> "ANSWER: FAX CONNECTION DEVICE '/dev/ttyT380'", but a fax is never received.
>
> In the tcpdump I see the correct handshaking between Asterisk and
> T38Modem, but finaly T38Modem makes a second REINVITE with "recvonly"
> and Asterisk answers with "SIP/2.0 488 Not acceptable here" and the call
> ends shortly after that.
>
> As far as I can see, T38Modem does not accept the portchange from rtp to
> udtpl and thus tries a REINVITE. Probably there is a problem in
> T38Modem, so I filed a bug at sourceforge for that:
>
> https://sourceforge.net/tracker/?func=detail&aid=3337581&group_id=152230&atid=783657
>
> But may be, somebody has a solution for this too.
>
>
> Thanks a lot,
> --
>
> Chau y hasta luego,
>
> Thorolf
>
> --
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