[asterisk-dev] Asterisk hangups after T.38 ReInvite

[Raj Jain]

I think its the missing Contact in MERA's 200 OK to Asterisk's RE-INVITE.
Contact is mandatory in 2XX responses.

Raj


On 4/2/07, Litnitchii Alexandr <sasha at asterisk-support.ru> wrote:
>
> Hi all.
> I have an issue sending/receiving faxes in  next environment:
> PSTN <-> Cisco (t.38 origination) <-> Mera (t.38 pass-through) 1.1.1.1
> <-> 2.2.2.2 Asterisk-1.4.2 (t.38 pass-through) 10.7.8.254  <->
> 10.7.8.125 Linksys SPA2100 (t.38 termination).
> There is a detailed log with sip messages debug in attachment. The
> summary of the issue is that call is answered, then Asterisk sends to
> Mera INVITE with m=image in SDP. Mera answers OK also with m=image, and
> some other parameters. Right after that Asterisk sends BYE to Mera, and
> i cannot understand the reason for that. Is that a bug?
>
> I can suppose here 2 reasons:
>
> 1. missing Contact: header in Mera's OK reply ( line number 601 )
>
>
> 2. Different T38 capability between asterisk <-> spa2100
> Our T38 capability (3856), peer T38 capability (3872), joint capability
> (3872)  (line 482)
>
> and  mera <-> asterisk
> Our T38 capability = (3856), peer T38 capability (32), joint T38
> capability (32) (line 632)
>
> Unfortunately i have no access to Mera, nor Cisco. As we were told,
> Cisco has next settings for our dialpeer:
> fax rate 9600
> fax-relay ecm disable
> fax protocol t38 ls-redundancy 5 hs-redundancy 2 fallback none
>
> I'm not sure if this is a bug of asterisk and whether i should submit a
> ticket.  But sending/receiving faxes does work if we exclude asterisk
> from the path and use it like
> PSTN <-> Cisco (t.38 origination) <-> Mera (t.38 pass-through) 1.1.1.1
> <-> DNAT Forwarding  <-> 3.3.3.3 Linksys SPA2100 (t.38 termination).
> Although Fax settings remain the same both at Cisco and SPA2100.
>
> Should i provide more information regarding the issue?
>
> I would really appreciate any suggestions.
>
> Best Regards,
>
> --
> Litnitchii Alexander
> "Comunicatii Libere" SRL
> http://www.asterisksupport.ru
> http://www.asterisk-support.com
>
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