A question related to transfer

I have achieved a call transfer through 3PCC between parties A and B and
have individual dialogs with both. 

After completion of the call, I now want to drop out of the signalling path
(either immediately or after an arbitrary amount of time). 

Is this legal? Can I send a refer with a replaces to A or B to achieve this?

Another related question

I've noticed that most endpoints accept a REFER (inside INVITE dialog) only
if we hold the INVITE dialog first. Is this because it is inside dialog? Can
I expect different behaviour if I send the request outside of a dialog?

Darshan

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