[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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