[Freeswitch-users] SDP With T.38 in INVITE Problem

[ivdreg ivdreg]

It comes form subscriber (ATCOM CPEs). As you know OpenSIPS is just a proxy
so cannot generate or rewrite SDP (generally speaking). Yes, I cannot fix
CPEs only server :(

Regards

2010/2/22 Steve Underwood <steveu at coppice.org>

> Hi Michael,
>
> On 02/23/2010 12:49 AM, ivdreg ivdreg wrote:
> > Hi Michael,
> >
> > As I said in a previous mails I know exactly what is happening.
> > In working setup:
> >
> > ITSP ---> YATE (GW - Frontend) ---> FreeSwitch (routing
> > server/xml_curl) ---> YATE (GW - SIP Interop) ---> OpenSIPS --->
> > Subscriber.
> >
> > I prefer to change YATE (GW - Frontend) and YATE (GW - SIP Interop)
> > with FreeSwitch for some reasons. The problem is:
> >
> > INVITE comes from ITSP and goes to subscriber via OpenSIPS. INIVITE
> > between FreeSwitch (routing server) and YATE (GW - SIP Interop)
> > contains SDP:
> > m=audio 21108 RTP/AVP 18 4 8 0
> > c=IN IP4 10.10.1.110
> > a=rtpmap:18 G729/8000
> > a=rtpmap:4 G723/8000
> > a=rtpmap:8 PCMA/8000
> > a=rtpmap:0 PCMU/8000
> > m=image 21108 udptl t38
> > c=IN IP4 10.10.1.110
> > a=T38FaxVersion:0
> > a=T38MaxBitRate:14400
> > a=T38FaxUdpEC:t38UDPRedundancy
> > a=T38FaxRateManagement:
> > transferredTCF
> >
> > And reply 200 OK contains in SDP:
> > *m=audio 34788 RTP/AVP 8*
> > a=rtpmap:8 PCMA/8000
> > a=silenceSupp:off - - - -
> > a=ptime:20
> >
> > Reply 200 OK SDP between YATE (GW - SIP Interop) and OpenSIPS contains
> > in SDP:
> > *m=audio 16330 RTP/AVP 8*
> > a=rtpmap:8 PCMA/8000
> > a=silenceSupp:off - - - -
> > a=ptime:20
> > *m=image 0 udptl 19*
> >
> > In this case everything works fine. Line *m=image 0 udptl 19 *is
> > removed by YATE.
> > But same test with FreeSWITCH on the place of YATE (GW - SIP Interop)
> > *"m=image 0 udptl 19" *call brakes as you can see in my first mail.
> >
> > I don't want to compare or discus YATE and FS functionality or
> > something else. I just see difference in behavior and because I'm not
> > a big expert don't know witch implementation is more accurate
> > according standards. And second: Is it impossible for me to upgrade
> > all CPE so only thing I can do is to fix it on server side. That is
> > because I ask for a help.
> You said the the broken line "m=image 0 udptl 19" goes from OpenSIPS to
> YATE. Do you know if it originates from the OpenSIPS box or the
> subscriber? If it originates from the OpenSIPS box it should be reported
> to them. If its from the subscriber, well...... your chances of getting
> anything fixed are usually small.
>
> Steve
>
>
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