I see there's a CUSTOM event called sofia::unregister. I presume that triggers whenever a phone doesn't re-register in enough time.

However, with default registation of 60 minutes (or even 10) I'd like more granularity.

I have the endpoints pinging FS, but I don't see an event or that information stored anywhere.

How about setting nat-options-ping (or better, all-reg-options-ping since most NATed endpoint don't actually self-identify).

Do I get an event if that fails?

I see unregister-on-options-fail but that seemed too aggressive when I tried that in the past.

What exactly does the less sever mark-dead-on-options-fail do? Does it remove it from the user/$NUMBER endpoint?

Does it trigger an event for me?

Other suggestions?