[SIPForum-discussion] Response for REFER

[Zhu Liang]

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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