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

[Litnitchii Alexandr]

Thanks, Raj Jain.
Yes, i've found in SIP RFC3261 paragraph 20.1 that Contact field is mandatory in 2XX responses. I'm just not sure that exactly it is the reason of breaking the session, because there seems to be no corresponding message.

I've already posted the issue at Mera's forum, but no reply yet :( .

Best regards,


Raj Jain wrote:
> 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
> <mailto: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 <http://1.1.1.1>
>     <-> 2.2.2.2 <http://2.2.2.2> Asterisk-1.4.2 (t.38 pass-through)
>     10.7.8.254 <http://10.7.8.254>  <->
>     10.7.8.125 <http://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 <http://1.1.1.1>
>     <-> DNAT Forwarding  <-> 3.3.3.3 <http://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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-- 
Litnitchii Alexander
"Comunicatii Libere" SRL
http://www.asterisksupport.ru
http://www.asterisk-support.com