RE: [MMUSIC] New draft: multiple times problem description:draft-garcia-mmusic-multiple-ptimes-problem-00.txt

Would a solution that meets REQ-10 and REQ-20 from
draft-ietf-mmusic-sdp-capability-negotiation-reqts also resolve the ptime
problem?

   REQ-10: It MUST be possible to indicate and negotiate alternative 
   media formats on a per media stream basis. 

      For example, many implementations support multiple codecs, but 
      only one at a time.  Changes between codecs cannot be done on-
      the-fly, e.g. when receiving a simple RTP payload type change. 

   REQ-20: It MUST be possible to indicate and negotiate alternative 
   attribute values ("a=") on a per media stream basis.  

      For example, T.38 [T38] defines new attributes that may need to 
      be conveyed as part of a capability. Also, alternative SRTP 
      keying mechanisms (e.g. [SDES] and [KMGMT]) may use SDP 
      attributes to negotiate SRTP keying material. 

I noticed your document didn't reference
draft-ietf-mmusic-sdp-capability-negotiation-reqts, but I think there is an
overlap of a requirement you have and the solution proposed in
draft-ietf-mmusic-sdp-capability-negotiation-05.txt.

-d

> -----Original Message-----
> From: Miguel Garcia [mailto:Miguel.Garcia@nsn.com] 
> Sent: Tuesday, May 29, 2007 3:41 AM
> To: mmusic
> Cc: Willekens, Marc
> Subject: [MMUSIC] New draft: multiple times problem 
> description:draft-garcia-mmusic-multiple-ptimes-problem-00.txt
> 
> Hi:
> 
> We have just submitted a new short draft that describes the 
> problem with 
> the lack of multiple packetization times in SDP.
> 
> The draft should be soon available in the traditional repositories. 
> Until that time, you can fetch a copy from:
> 
> http://people.nokia.net/~miguel/drafts/draft-garcia-mmusic-mul
> tiple-ptimes-problem-00.txt
> http://people.nokia.net/~miguel/drafts/draft-garcia-mmusic-mul
> tiple-ptimes-problem-00.html
> 
> We are aware that the issue has been discussed in the past, without a 
> clear conclusion on whether a problem exists. We believe there is an 
> interoperability problem, and thus, we are soliciting 
> comments about it. 
> At this stage, we are not discussing solutions yet, we rather agree 
> first that there is a problem that needs to be solved.
> 
> /Miguel
> -- 
> Miguel A. Garcia           tel:+358-50-4804586
> Nokia Siemens Networks     Espoo, Finland
> 
> 
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