[hylafax-users] Hylafax and t38modem: "Ring detected without successful handshake"

[Mark Norton]

I've been working with this for some time now without being able to find a solution. I've searched for weeks without resolution.

My goal is to send faxes from a SIP server to a standalone fax gateway running Hylafax and t38modem. The gateway would receive a fax from the local SIP server and then send it on via the analog modem.

I have tried various distributions and versions and found that this seems the most stable, (although it still doesn't work):

Ubuntu 11.04
Hylafax 6.0.5
T38modem 2.0
Opal r 24174 (from svn)
PTlib r 24174 (from svn)

T38modem is set to answer after 2 rings, and it does pickup.

Here's the t38modem command that I'm running (formatted for readability):

t38modem -o /var/log/t38modem.log
--sip-proxy T38modem:12...@192.168.100.31
--sip-disable-t38-mode
--sip-register T38m...@192.168.100.31,1234<mailto:T38m...@192.168.100.31,1234>
--sip-audio G.711-uLaw-64k
--ptty "+/dev/ttyT38-1,+/dev/ttyT38-2,+/dev/ttyT38-3"
--route "sip:.*=modem:<dn>;OPAL-Disable-T38-Mode=true"
--route "modem:.*=sip:<dn>@192.168.100.31"
--no-h323

As it says in the subject line, there is no handshake. I see the message in the syslog but all other log files and output look good.

When making a voice call to the gateway, I would expect to hear a fax tone. While the server picks up the call, there is no audio coming from the fax gateway as one would expect.

Thanks for your help!

Mark Norton

[mnorto]

On Jul 17, 9:57 pm, Mark Norton <m...@telstrong.com> wrote:
> I've been working with this for some time now without being able to find a solution.  I've searched for weeks without resolution.
>
> My goal is to send faxes from a SIP server to a standalone fax gateway running Hylafax and t38modem.  The gateway would receive a fax from the local SIP server and then send it on via the analog modem.
>
> I have tried various distributions and versions and found that this seems the most stable, (although it still doesn't work):
>
> Ubuntu 11.04
> Hylafax 6.0.5
> T38modem 2.0
> Opal r 24174 (from svn)
> PTlib r 24174 (from svn)
>
> T38modem is set to answer after 2 rings, and it does pickup.
>
> Here's the t38modem command that I'm running (formatted for readability):
>
> t38modem          -o /var/log/t38modem.log

> --sip-proxy T38modem:1...@192.168.100.31
> --sip-disable-t38-mode
> --sip-register T38mo...@192.168.100.31,1234<mailto:T38mo...@192.168.100.31,1234>

> --sip-audio G.711-uLaw-64k
> --ptty "+/dev/ttyT38-1,+/dev/ttyT38-2,+/dev/ttyT38-3"
>  --route "sip:.*=modem:<dn>;OPAL-Disable-T38-Mode=true"
> --route "modem:.*=sip:<dn>@192.168.100.31"
> --no-h323
>
> As it says in the subject line, there is no handshake.  I see the message in the syslog but all other log files and output look good.
>
> When making a voice call to the gateway, I would expect to hear a fax tone. While the server picks up the call, there is no audio coming from the fax gateway as one would expect.
>
> Thanks for your help!
>
> Mark Norton

I figured out by reading old posts from the t38modem sipport requests
that you need to have spanDSP "http://www.soft-switch.org/downloads/
spandsp/spandsp-0.0.6pre17.tgz" compiled and installed, and the Opal
plugin made and installed in order to get this to pickup.

See: http://sourceforge.net/tracker/index.php?func=detail&aid=2946607&group_id=152230&atid=783657

Vyacheslav Frolov is my hero.

[yasar...@gmail.com]