Re: [Sip] draft-ietf-sip-rfc2543bis-09 and the offer/answer model

frank.derks@philips.com wrote:
> The latest version of the SIP draft contains the following text: 
> 
> "The offer/answer model defines restrictions on when offers and answers 
> can be made. This results in restrictions on where the offers and 
> answers can appear in SIP messages. In this specification, offers and 
> answers can only appear in INVITE requests and responses, and ACK. The 
> usage of offers and answers is further restricted." 
> 
> The first sentence states that the offer/answer model defines when
> offers 
> and answers can be made. From draft-ietf-mmusic-sdp-offer-answer-02, it 
> does not really become clear that this is the case. Which restrictions 
> are being referred to? 

Its referring to this paragraph:

At any time, either agent MAY generate a new offer that updates the
    session. However, it MUST NOT generate a new offer if it has received
    an offer which it has not yet answered or rejected. Furthermore, it
    MUST NOT generate a new offer if it has generated a prior offer for
    which it has not yet received an answer or a rejection. If an agent
    receives an offer after having sent one, but before receiving an
    answer to it, this is considered a "glare" condition.

-Jonathan R.

-- 
Jonathan D. Rosenberg, Ph.D.            72 Eagle Rock Avenue
Chief Scientist                         First Floor
dynamicsoft                             East Hanover, NJ 07936
jdrosen@dynamicsoft.com                 FAX: (973) 952-5050
http://www.jdrosen.net                  PH:  (973) 952-5000
http://www.dynamicsoft.com

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