[asterisk-dev] fallback to audio faxing when T.38 INVITE fail with 488/606 Not acceptable

[Kristijan Vrban]

i can offer the patch for 1.4 on issue.asterisk.org but digium must
decide if this is a bugfix or a feature.
@digium bugfix or feature?

Kristijan

p.s.
and yes, i also would like to upgrade to 1.6. but this decision taken
by the management team, and unfortunately not the technical staff :-(

2010/1/18 Klaus Darilion <klaus.mailinglists at pernau.at>:
>
>
> Kristijan Vrban schrieb:
>> I took a look into 1.6 source. 1.6 does a re-re-INVITE to audio after
>> its T.38 re-INVITE failed. A backport is simple. But i think in
>> allready know the answer. No, this is a new feature, no new features
>> into 1.4 So one more backport patch into my patch folder for my
>> asterisk 1.5 :)
>
> IMO this isn't a new feature, but a bugfix.
>
> I experienced same problems too.
>
> regards
> klaus
>
>>
>> kristijan
>>
>> 2010/1/13 Kevin P. Fleming <kpfleming at digium.com>:
>>> Kristijan Vrban wrote:
>>>>> However, the original message was a bit unclear if it was a re-invite or an invite.
>>>> re-invite
>>>>
>>>> And there is no difference if chan_sip get a 488 or 606 for the T.38
>>>> re-INVITE (both are valid response) . As far as i can see, there is
>>>> simply no logic that handle a fallback to audio fax when the caller
>>>> can not handle T.38? I examined how a Cisco/Linksys SPA2120 handel
>>>> this: It ACK the 488/606 for its rejected T.38 re-INVITE and send a
>>>> re-re-INVITE with PCMU, and then the fax is transported via audio RTP.
>>> If Asterisk sends a re-INVITE to T.38, and the other end rejects it,
>>> there is nothing to be done to 'fallback' to audio mode; the call is
>>> still in audio mode, because it never left audio mode.
>>>
>>> Also, you are doing this testing with Asterisk 1.4, which has very
>>> limited support for T.38; the T.38 support in Asterisk 1.6.x is vastly
>>> improved, and I'd highly encourage you to use instead if you can.
>>>
>>> --
>>> Kevin P. Fleming
>>> Digium, Inc. | Director of Software Technologies
>>> 445 Jan Davis Drive NW - Huntsville, AL 35806 - USA
>>> skype: kpfleming | jabber: kpfleming at digium.com
>>> Check us out at www.digium.com & www.asterisk.org
>>>
>>> --
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>>
>
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