[reSIProcate] Subscription Handler in case of REFER

[Nilay Tripathi]

Hi,

I was going through the DUM code to understand how REFER would work.
In case of un-attended transfer, I would send a refer to the other party,
and I receive a 202. This would call onReferAccepted and does not provide
any ClientSubscriptionHandler. Further, on receiving a NOTIFY,
onReferAccepted is called again and this time the handler is provided. I can
very well store this  handle for future use/reference.

One thing I don't understand here is that I will have to re-define the
call-backs (with respect to refer) and add it to DUM under some symbol. RFC
3515 defines event package name as "refer" and defines an additional
parameter as "id". Symbols.hxx doesn't have "refer" but it does have "id".
But the comment refers it for RFC 3323 (Privacy) which misleads me. So is it
OK or otherwise which Symbol can I use.

So two queries:
1. Do I add new definitions of refer callbacks as
                       dum.addClientSubscriptionHandler(Symbols::id, myObj);
                       dum.addServerSubscriptionHandler(Symbols::id, myObj);
2. I hope that Subscription handler would still be alive after sending the
BYE in case of un-attended transfer.

Thanks in Advance !!

Regards,
Nilay
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