[SIPForum-discussion] SDP in 180 Ringing & 200 OK

[nitin kapoor]

Hari,

Could you please provide us the ethereal traces file.

Thanks
Nitin Kapoor

2009/5/20 hari prasad <siphari at gmail.com>

> Hello All,
> I have a basic doubt regarding the SDP  Answer, in a Offer/Answer model.
> Can there be a ANSWER in both 180 and 200 OK?
> If so, is that mandatory to have the same SDP in both the response?
>
> I have the following two Answers in one of my scenario:
>
> *180 Ringing:*
> v=0
> o=- 3654100372 1235990184 IN IP4 *192.168.13.13*
> s=SDP Data
> c=IN IP4 *192.168.13.13*
> t=0 0
> m=audio *46608* RTP/AVP 18 8 96
> a=rtpmap:96 telephone-event/8000
> a=ptime:20
> a=sqn:0
> a=cdsc:1 image udptl t38
> a=cpar:a=T38FaxVersion:0
> a=cpar:a=T38MaxBitRate:14400
> a=cpar:a=T38FaxRateManagement:transferredTCF
> a=cpar:a=T38FaxMaxBuffer:336
> a=cpar:a=T38FaxMaxDatagram:176
> a=cpar:a=T38FaxUdpEC:t38UDPRedundancy
>
> *200 OK:*
>
> v=0
> o=- 3805400806 1235990190 IN IP4 *192.168.13.25*
> s=SDP Data
> c=IN IP4 *192.168.13.25*
> t=0 0
> m=audio *52138* RTP/AVP 18 8 96
> a=rtpmap:96 telephone-event/8000
> a=ptime:20
> a=sqn:0
> a=cdsc:1 image udptl t38
> a=cpar:a=T38FaxVersion:0
> a=cpar:a=T38MaxBitRate:14400
> a=cpar:a=T38FaxRateManagement:transferredTCF
> a=cpar:a=T38FaxMaxBuffer:336
> a=cpar:a=T38FaxMaxDatagram:176
> a=cpar:a=T38FaxUdpEC:t38UDPRedundancy
>
> Here the *Owner*, *Connection* and *Audio Port* were all different.
> Is this RFC complaint?
> Should the UAC consider only the SDP in 200 OK?
>
> Thanks in Advance.
> Kind Regards,
> Hari Prasad V
>
>
>
>
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