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

[ivdreg ivdreg]

Thanks Michael,

I will try to find some solution/workaround.

2010/2/22 Michael Jerris <mike at jerris.com>

> the port 0 with PT of 19 is sofia rejecting the sdp becuase we don't
> support it.
>
>
> On Mon, Feb 22, 2010 at 12:10 PM, Steve Underwood <steveu at coppice.org>wrote:
>
>> 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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>
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