[Asterisk-Users] SIP register and unregister events via Manager API

[Holger Schurig]

> And I would very much like feedback on those - are they useful?
> If they are, I'll backport to chan_sip.

I find them useful (for the HTML based block LED field display of DeStar). 
Today I even thought about writing a patch that sends the 
available/unavailable messages from the quality=... code to the Manager.