Re: [Sip] Getting "Media Format = 0"

[Nitin Kapoor <[e-mail]>]

Yes.. i agree with you.. i haven't seen payload 18 on any SDP( niether from
source nor from remote).

Now here is my doubt about media format...is the correct to leave it "0"

Thanks,
Nitin Kapoor
On 13 March 2010 11:27, Vijay Tiwari <[e-mail]> wrote:

> Hello Nitin
>
> If you are talking about codec payload then
>
> " I can see we are getting the 2 codecs in SDP(G.711 & G.729) with payload
> "0, 101, 19". "
>
> in this payload there is no G.729 because for G.729 payload is 18.
>
> thanks
> vijay
>
>
> On Fri, Mar 12, 2010 at 7:36 PM, Nitin Kapoor <[e-mail]>wrote;wrote:
>
>> Hello Friends,
>>
>> I am facing the problem with one of my client. I can see we are getting
>> the 2 codecs in SDP(G.711 & G.729) with payload "0, 101, 19".
>>
>> Now here is my doubt is that whenver my client is sending the SDP in
>> initial OFFER with G.729 its offering "Media format = 0".But when i checked
>> the RFC 3264 and others, then i observed that it can be possible if you have
>> two codecs in one SDP then one media format can be "0".
>>
>> Below is the OFFERED SDP from my SOURCE UA.
>>
>> Media Description, name and address (m): audio 17890 RTP/AVP 0 101 19
>> Media Type: audio
>> Media Port: 17890
>> Media Protocol: RTP/AVP
>> Media Format: ITU-T G.711 PCMU
>> Media Format: DynamicRTP-Type-101
>> Media Format: Comfort noise (old)
>>
>> Connection Information (c): IN IP4 212.48.160.163
>> Connection Network Type: IN
>> Connection Address Type: IP4
>> Connection Address: 212.48.160.163
>>
>> Media Attribute (a): rtpmap:0 PCMU/8000
>> Media Attribute Fieldname: rtpmap
>> Media Format: 0
>> MIME Type: PCMU
>> Sample Rate: 8000
>>
>> Media Attribute (a): rtpmap:101 telephone-event/8000
>> Media Attribute Fieldname: rtpmap
>> Media Format: 101
>> MIME Type: telephone-event
>> Sample Rate: 8000
>>
>> Media Attribute (a): fmtp:101 0-16
>> Media Attribute Fieldname: fmtp
>> Media Format: 101 [telephone-event]
>> Media format specific parameters: 0-16
>> Media Attribute (a): rtpmap:19 CN/8000
>> Media Attribute Fieldname: rtpmap
>> Media Format: 19
>> MIME Type: CN
>> Sample Rate: 8000
>>
>> Media Attribute (a): ptime:20
>> Media Attribute Fieldname: ptime
>> Media Attribute Value: 20
>>
>> Here is SDP is offered by my Remote Entity in 183 Session progress in the
>> correspondence of of INITIAL INVITE.
>>
>> Media Description, name and address (m): audio 5870 RTP/AVP 0 101
>> Media Type: audio
>> Media Port: 5870
>> Media Protocol: RTP/AVP
>> Media Format: ITU-T G.711 PCMU
>> Media Format: DynamicRTP-Type-101
>> Media Attribute (a): rtpmap:0 PCMU/8000
>> Media Attribute Fieldname: rtpmap
>> Media Format: 0
>> MIME Type: PCMU
>> Sample Rate: 8000
>> Media Attribute (a): sendrecv
>> Media Attribute (a): rtpmap:101 telephone-event/8000
>> Media Attribute Fieldname: rtpmap
>> Media Format: 101
>> MIME Type: telephone-event
>> Sample Rate: 8000
>>
>>
>> Now the problem which i am facing is that after  doing the Negotiation and
>> the ACK of 200 OK in the correspondence in INITIAL OFFER/INVITE, i am
>> getting a BYE  immediately from my source UA.
>>
>> Could anyone please help me to diagnose this.
>>
>> Thanks,
>> Nitin kapoor
>>
>>
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>
>
>
> --
> They can because they think they can.
>
>