Dale,
There are a couple of things in your draft on which I am not clear:
Section 3.2 Attended Transfers
In F8, INVITE to Carol you have included a References header with “rel-xfer”.
How does Bob’s UA know to include this header at this time? Bob has an existing session with Alice but at the time of the INVITE to Carol, F8, the UA does not know that a transfer is intended. The INVITE may be an enquiry call with no intent to transfer. Are you proposing that all INVITE requests when you have another session on hold will include this header in case you decide to transfer later?
Section 3.3 Call Pick-up
F3 is a Subscribe using the dialog event package. RFC 4235 requires that the dialog event package includes a Call-id and a To-tag. Am I missing something here? Perhaps there is another request which is not included in your diagram?
Can you please clarify?
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DUCI LDC UK
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