Hello
I was referencing the RFC 3515 regarding messaging for transfers based
on SIP REFER.
Is the UA processing the REFER required to send NOTIFY subscription
event messages to the sender agent notifying the progress of the
transfer like 100 trying, 180 ringing, 200 OK. Is this a MUST?
I am pasting below a snippet of the RFC which says it must. I would like
to confirm this within the forum
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.
Thanks in advance
Dushyant
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