Agree with Attila. So in the given circumstance the UAS could have
responded to the invite with a 488 to indicate that it didn't support
the offered media.
Another possibility is for the UAS to return an answer where the port in
the m-line is zero, thus rejecting the media stream since it can't
handle any of the offered media. It could also include in that m-line
the codecs it *does* support as an indication, though they will not be
used at that time.
Then the UAS could initiate another offer with the codecs it does
support, in hopes of getting a working call.
Whether that is better than the 488 is arguable. Probably not in most cases.
Thanks,
Paul
Attila Sipos wrote:
> 415 is often confused with 488.
>
> "415 Unsupported Media Type" is what you would use if if didn't understand
> the SIP message body content.
>
> 488 (which is similar to 606) would be a more suitable response:
>
> 21.4.26 488 Not Acceptable Here
>
> The response has the same meaning as 606 (Not Acceptable), but only
> applies to the specific resource addressed by the Request-URI and the
> request may succeed elsewhere.
>
> and 606 is described as...
>
> The user's agent was contacted successfully but some aspects of the
> session description such as the requested media, bandwidth, or
> addressing style were not acceptable.
>
> A 606 (Not Acceptable) response means that the user wishes to
> communicate, but cannot adequately support the session described.
> The 606 (Not Acceptable) response MAY contain a list of reasons in a
> Warning header field describing why the session described cannot be
> supported. Warning reason codes are listed in Section 20.43.
>
>
> Regards,
> Attila
>
>
> -----Original Message-----
> From: [email protected]
> [mailto:[email protected]] On Behalf Of Peter
> Nijhuis
> Sent: 27 April 2009 14:30
> To: Shanbhag, Somesh (NSN - IN/Bangalore); ext friend friend; sip fourm
> Subject: Re: [Sip-implementors] Query for SDP Negotiation
>
> I think Callee should respond with 415 unsupported media type, since it is
> not supporting media types 102, 0, 8 or 106.
>
> Met vriendelijke groet, with kind regards, mit freundlichen Gruß
>
> Peter Nijhuis
>
>
>
>> -----Original Message-----
>> From: [email protected] [mailto:sip-
>> [email protected]] On Behalf Of Shanbhag,
>> Somesh (NSN - IN/Bangalore)
>> Sent: maandag 27 april 2009 15:07
>> To: ext friend friend; sip fourm
>> Subject: Re: [Sip-implementors] Query for SDP Negotiation
>>
>> The basic thing is CALLEE has to take the subset of codecs offered by
>> CALLER and reply back.
>> But in your case, CALLEE is replying with different set of codecs (97
>> 101) in reply to CALLER codecs ( 102 0 8 106 ) IMHO, since the
>> capabilities mis-match, immdiately end the call using BYE / CANCEL
>> which ever is relevant.
>>
>>
>> Somesh
>>
>> -----Original Message-----
>> From: [email protected] [mailto:sip-
>> [email protected]] On Behalf Of ext friend
>> friend
>> Sent: Monday, April 27, 2009 2:59 PM
>> To: sip fourm
>> Subject: [Sip-implementors] Query for SDP Negotiation
>>
>> Dear Folks,
>> I have doubt in the following scenario.
>>
>> Caller's sdp :
>>
>> v=0
>> o=- 1234 1 IN IP4 10.10.20.35
>> s=-
>> c=IN IP4 10.10.20.35
>> t=0 0
>> m=audio 12000 RTP/AVP 102 0 8 106
>> a=rtpmap:102 iLBC/8000
>> a=rtpmap:0 PCMU/8000
>> a=rtpmap:8 PCMA/8000
>> a=rtpmap:106 telephone-event/8000
>>
>>
>> Callee's negotiated sdp :
>>
>> v=0
>> o=- 3449811996 3449811996 IN IP4 10.10.20.4 s=SJphone c=IN IP4
>> 10.10.20.4 t=0 0 m=audio 49164 RTP/AVP 97 101 c=IN IP4 10.10.20.4
>> a=rtpmap:97 iLBC/8000
>> a=rtpmap:101 telephone-event/8000
>> a=fmtp:101 0-16
>> a=setup:active
>> a=sendrecv
>>
>> In this case,Is callee's negotiation method is wrong?
>>
>> Callee should send like m=audio 49164 RTP/AVP 102 106 rite?
>>
>> In this case, after call establishment,
>> from caller sending RTP using 102 (UnKnown)
>> from callee sending RTP using 97 (iLBC)
>>
>> So caller hearing callee's audio but callee not able to hear caller's
>> audio.
>>
>> please clarify this issue.
>>
>> Thanks & Regards,
>> vijay
>>
>>
>> Bring your gang together. Do your thing. Find your favourite
>> Yahoo! group at http://in.promos.yahoo.com/groups/
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