[Freeswitch-users] Empty SDP in 200 OK on received re-invite while faxing with T.38

Michael Jerris mike at jerris.com
Thu Mar 10 17:48:27 MSK 2016


also make sure you are testing latest master, we fixed some fax issues last
week

On Wednesday, March 9, 2016, Brian West <brian at freeswitch.org> wrote:

> Ok, without some logs, or traces I can only guess here, happen to have
> those handy in a pastebin?
>
> On Wed, Mar 9, 2016 at 4:59 AM, Dmitry Saratsky <simpot at gmail.com
> <javascript:_e(%7B%7D,'cvml','simpot at gmail.com');>> wrote:
>
>> Hi all,
>>
>> I found that some of my faxes failed to be sent/received bcz remote PBX
>> drop the calls after my FreeSWITCH send empty (without SDP) 200 OK message
>> on received re-invite from remote party while sending or receiving fax with
>> T.38.
>>
>> CLIENT > INVITE (G.711) > FS
>> FS > 200 OK > CLIENT
>> CLIENT > INVITE (T.38) > FS
>> FS > 200 OK > CLEINT
>> ...
>> now receiving fax
>> while fax is received, client send me reinvite with the same SDP T.38
>> details as in initial T.38 INVITE message. usually it happens after 900 or
>> 1800 seconds - probably it kind of keepalive...
>> FS > 200 OK (with no SDP) > CLEINT
>> now call is dropped(
>>
>> freeswitch: Version 1.5.15b git 3d64402 2015-03-21 19:55:21Z 64bit
>> centos 6 x64
>>
>> any ideas?
>>
>> _________________________________________________________________________
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>
>
>
> --
>
> *Brian West*
> brian at freeswitch.org
> <javascript:_e(%7B%7D,'cvml','brian at freeswitch.org');>
>
>
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