Hello All,
What is the way to CANCEL the INVITE's trigerred from a REFER
request . ?
1.) What i understand is that one way is to use the Dialog event package and
then send a REFER request with the method=CANCEL, adding the Target-Dialog
header, with whatever information is available from the NOTIFY. i.e a Half
Dialog information, which is the From tag and the Call-Id, of the INVITE
request.
2. ) Is it also possible that we use the SIP Response headers that are passed
in the NOTIFY ( received due to the implicit subscription that the REFER
creates ) and form the Target-Dialog header ? i.e if the REFER recepient sends
the Call-Id, From header and To Header in the NOTIFY messages apart from the
SIP Response line.
3.) Finally, if the REFER request creates an implicit subscription, which also
means that there is some mapping between the REFER dialog and the INVITE
transaction at the REFER recipient ( as the REFER recipient, sends NOTIFY'ies
for the Invite transaction responses) , would a REFER with a method=CANCEL ,
without a Target-Dialog header be enough ? As the REFER recipient knows exactly
which transaction it has to CANCEL ( As there is already some mapping ).
Please let me know your thoughts .
Thank you.
Best regards,
Simith
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