Subject: [Sip] Help: About Early-Session and Session

From: [email-masked]
Date: Thu, 26 Oct 2006 09:40:09 +0800

Dear Sip Group,

     There encounters a question when I read RFC 3959 and RFC 3960 which 
refer to the Early-Session , that is
 
       "Does Offer/Answer Model defined in RFC 3264 apply to Early-Session 
and Session independently?"

     In RFC 3959 section 7, there is a example as below:
      A                           B
      |                           |
      |--------(1) INVITE-------->|
      |            offer          |
      |                           |
      |<--(2) Session Progress----|
      |       early-offer         |
      |       answer              |
      |                           |
      |---------(3) PRACK-------->|
      |             early-answer  |
      |                           |
      |<--------(4) 200 OK--------|
      |                           |
      |  *                     *  |
      | ************************* |
      |*       Early Media       *|
      | ************************* |
      |  *                     *  |
      |                           |
      |<--------(5) 200 OK--------|
      |                           |
      |----------(6) ACK--------->|
      |                           |

          Figure 1: Message flow

    Hope to have a letter from you soon.

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