[SIPForum-discussion] UE disabling call with setting both audio and image port = 0

[ashok.pitambar at wipro.com]

Hi Albert,

I guess it is the typo ,  the proper response you may be expecting is "488 Not Acceptable Here/415 Unsupported Media Type".
I am not sure why you are expecting "405 Method Not Allowed" this response expected only when UA sends any SIP method which
is unsupported at other end.

Coming back to your question I see warning "305 devnull "no common codec for audio"" in header Warning , When there is no common
codecs exists then call should be terminated with appropriate client error.

Description:

488 Not Acceptable Here

This response indicates that some aspect of the proposed session is not acceptable
and may contain a Warning header field indicating the exact reason.
This response has a similar meaning to 606 Not Acceptable, but only
applies to one location and may not be true globally as the 606 response
indicates.

415 Unsupported Media Type

This response sent by a user agent indicates that the media type contained in the
INVITE request is not supported. For example, a request for a video conference
to a PSTN gateway that only handles telephone calls will result in this response.
The response should contain header fields to help the UAC reformulate the
request.

Regards,
Ashok Pitambar

From: discussion-bounces at sipforum.org [mailto:discussion-bounces at sipforum.org] On Behalf Of Albert Etsebeth
Sent: Thursday, February 09, 2012 6:21 PM
To: discussion at sipforum.org
Subject: [SIPForum-discussion] UE disabling call with setting both audio and image port = 0

Hi All

I'd like to confirm the call-flow whereby a Endpoint answers the call with a 200 OK but then disables both Audio and Video streams in the SDP.
Is this a known response for certain call flow that is breaking , as I was expecting a "488 Method not allowed" message

m=audio 0 RTP/AVP 0
m=image 0 udptl t38


A                   -> INVITE (PCMA & PCMU) ->                                   B
A                                  <- 180 Ringing <-                                                                                            B
A                                  <- 200 OK <-                                                                                                    B






SIP/2.0 200 OK
Via: SIP/2.0/UDP 172.16.0.10:5060;branch=z9hG4bK20qqrq30dgggoic0k7l1.1
Contact: <sip:5000 at 172.16.0.50:1811;rinstance=faabd6cb5255ba99>
To: <sip:5000-s37qirsbgjuaa at 192.168.0.10:5060;rinstance=faabd6cb5255ba99;transport=udp>;tag=a7516e75
From: "Anonymous"<sip:Anonymous at anonymous.invalid>;tag=as7d4b19c1
Call-ID: 0f568e662f611829405f3d3469b0ca1c at 192.168.0.100:5060
CSeq: 102 INVITE
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY, MESSAGE, SUBSCRIBE, INFO
Content-Type: application/sdp
User-Agent: eyeBeam release 1104g stamp 54686
Warning: 305 devnull "no common codec for audio"
Content-Length: 131

v=0
o=- 9 2 IN IP4 172.16.0.50
s=CounterPath eyeBeam 1.5
c=IN IP4 172.16.0.50
t=0 0
m=audio 0 RTP/AVP 0
m=image 0 udptl t38

Thanks umbru




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