[asterisk-users] res_fax T.38 Gateway with SpanDSP - Force ReINVITE?

[Dave Fullerton]

On 10/22/2014 03:55 PM, Tim Nelson wrote:
> ----- Original Message -----
>
>> Greetings-
>
>> Working with the T.38 gateway functionality that is sparsely
>> documented [1], I'm attempting to get the following functional:
>
>> Asterisk calling system -> Asterisk system in T.38 Gateway Mode (box
>> in question) -> SIP Provider
>
>> The problem is:
>
>> -The provider is not initiating a reinvite to T.38, even though it is
>> 100% supported
>> -Asterisk is not detecting the CNG tones from the far side of the
>> call and initiating a T.38 session on that call leg (with the SIP
>> provider), but *DOES* attempt to initiate a T.38 session with the
>> calling Asterisk system (which rejects with SIP/488 as expected)
>
>> So, how does one force a reinvite to T.38 on the outbound call leg in
>> this scenario? I did find the same problem from another user on the
>> list in the archives, but didn't find a solution contained within
>> the responses [2].
>
>> Thank you,
>
>> --Tim
>
>> [1] https://wiki.asterisk.org/wiki/display/AST/T.38+Fax+Gateway
>> [2]
>> http://lists.digium.com/pipermail/asterisk-users/2012-July/273535.html
>
>
> *bump*
>
> Any thoughts? I'm quite familiar with the T.38 functionality within Callweaver, and a function is provided there to do exactly what I need ( SipT38SwitchOver() ). However, given Callweaver is ancient at this point, and better T.38 features such as "gateway" do not function, I am pressed to use Asterisk (11.13.1) with SpanDSP (0.0.5, latest from Github since spandsp.org is down) for this job. :)
>
> Thanks!
>
> --Tim
>

I can't help with your root problem (maybe check "core show function 
FAXOPT"?), but the spandsp site is up. Try using www.spandsp.org. 
Downloads are available here: http://www.spandsp.org/downloads/spandsp/

-Dave