[SIPForum-discussion] Response for REFER

[Graziani, Germano (Germano)** CTR **]

Hi Liang,
 
You're right: the RFC is not so clear about REFER handling and for this reason SIP phones handled REFER message in different ways.
 
In generale seems that 200OK message is acceptable, but it is better discuss this point with the customer and/or supplier.
 
Best Regards. Germano.

-----Original Message-----
From: discussion-bounces at sipforum.org [mailto:discussion-bounces at sipforum.org]On Behalf Of Zhu Liang
Sent: Tuesday, August 09, 2005 14:47
To: discussion at sipforum.org
Subject: [SIPForum-discussion] Response for REFER


Hi all, 
I have some confusion about SIP REFER, if a UA receives an 200 OK instead of 202 Accepted for his REFER message, is it correct? I read a little RFC3515 
in 2.4.2 it says :

   If no final response has been generated according to the rules above,

   the UA MUST return a 202 Accepted response before the REFER

   transaction expires.


It seems that it MUST send the 202 Accepted.

But the following paragragh says:


   If a REFER request is accepted (that is, a 2xx class response is

   returned), the recipient MUST create a subscription and send

   notifications of the status of the refer as described in Section

   2.4.4.
Here the 2xx class seems to mean that it is also acceptable for a 200 OK message.

Would anyone tell me 200 OK message for REFER is acceptable and if not how would the UA do for it?




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