This is actually quite a strange usecase. It's useful when calls do not route internally on Kamailio but are always forced out through a B2BUA which routes back to Kamailio for eventual delivery to the phone. In this case, you can disable callee (recipient) notifications for the outbound call leg from Phone->Kamailio->B2BUA and caller (initiator) notifications for the inbound leg from B2BUA->Kamailio->Phone.
In this case, you don't get notifications for 2 dialogs for each party on the call - rather 1 dialog per party. For a BLF phone, this doesn't really change anything however when BLF notifications are used to trigger events in other systems, it can be helpful to de-duplicate the messages.
I can't imagine there will be a queue of people wanting to use this... but it's implemented in such a way that behavior won't change unless the flags are defined and implemented.
https://github.com/kamailio/kamailio/pull/979
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