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

[John Atkinson]

If you're referring to RFC 3960, this is an "Informational" RFC and not
"Standards Track". Therefore, you should assume that implementations do
not always follow the procedures described in it. 

John Atkinson 

-----Original Message-----
From: discussion-bounces at sipforum.org
[mailto:discussion-bounces at sipforum.org] On Behalf Of Ayyanar PK
Sent: Thursday, May 21, 2009 12:01 AM
To: nitin kapoor
Cc: hari prasad; discussion at sipforum.org
Subject: Re: [SIPForum-discussion] SDP in 180 Ringing & 200 OK


The UAC should consider the SDP answer in 180 Ringing and shall ignore
the SDP answer in 200OK. I guess the SDP in 180 and 200OK should be the
same. Refer to the RFC that has specification about early media feature.

Regards,
Ayyanar



	---------- Original message ----------
	From:nitin kapoor< nitinkapoorr at gmail.com >
	Date: 20 May 09 23:31:02
	Subject: Re: [SIPForum-discussion] SDP in 180 Ringing & 200 OK
	To: hari prasad 
	
	Hari,
	
	Could you please provide us the ethereal traces file.
	
	Thanks
	Nitin Kapoor
	
	
	2009/5/20 hari prasad <siphari at gmail..com
<mailto: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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