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[MMUSIC] SDP Capabilities Negotiation : Delete attributes



Title: SDP Capabilities Negotiation : Delete attributes

Hi

I have some questions regarding the delete attributes mentioned section 3.5.1 (page 24) as I still after reading through the same text a few times may have misunderstood:

The example
  a=pcfg:1 a=-m:1,2,[3,4]|1,7,[5]
My interpretation is : delete all the attributes on media level and specify the new attributes. Is this correct ?
When is this needed ?, is the projected use case that one send a reinvite with a new SDP. I miss some text that actually motivates the use of the delete attributes option. 

/Ingemar
*******************************************
Ingemar Johansson
Senior Research Engineer, IETF "nethead"
EAB/TVP - Multimedia Technologies
  Ericsson Research Ericsson AB
  Box 920 S-971 28 Luleå, Sweden
Tel: +46 (0)8 4043042
ECN: 850-43042
ECC: 850-43074
Mobile: +46 (0)730 783289
*******************************************
 


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