[SIPForum-discussion] REFER subscription termination.

ashish rawat ashish_rawat1986 at yahoo.co.in
Mon Apr 13 12:54:20 UTC 2015

Hi All,
Is below a valid REFER subscription termination flow:-
GW                                  CVP                                VXML         ---------->Invite                                               ---------------->Invite                                             <-----200Ok (invite)    <-----200 Ok (Invite)   ----------> ACK     <---------REFER (To 878883481250)    --------->202(Accepted)             -------------->BYE                                          <------------200 Ok   -----------> Notify (Trying)   <-----------200 Ok   -----------> Notify (Ringing)   <-----------200 Ok  // Here after 60 seconds,CVP sends  extends it  subscription via SUBSCRIBE to GW . However this Subscribe is responded with 503Service Unavailable//    <-----SUBSCRIBE (REFER EVENT)    ---------> 503 Service Unavailable
>From the RFC I see the following.

https://www.ietf.org/rfc/rfc3515.txt  “The agent issuing the REFER may extend its subscription usingthe   subscription refresh mechanisms described in [2]. A minimal, but complete, implementation can respond with asingle   NOTIFY containing either the body:       SIP/2.0 100 Trying    if the subscription is pending, the body:       SIP/2.0 200 OK    if the reference was successful, the body:       SIP/2.0 503 Service Unavailable    if the reference failed, or the body:       SIP/2.0 603 Declined"
Thanks,Ashish Rawat
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