I would like to understand different possible SIP REINVITE Scenarios.
>From my knowledge there are three occasions where reinvite could occur,

Scenario 1 - To make a Call On Hold by sending a reinvite with
sendonly/recieveonly
Scenario 2 - To change parameters of the original connecting information
Scenario 3 - Allows periodic refresh of the SIP sessions through re-INVITE

Is there any other possibile Reinvite scenarios?

If you could share your knowledge on this that would be great.
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