I have a nagios setup which ensures that SIP is responsive on my Asterisk server, that's straight forward.
My question is, what kind of possibilities are there that the Asterisk server can actually terminate properly with the termination provider? As in produce a test call and ensure that something on the other end picks up?
I realize this is a multi-part and very difficult problem. Without expensive equipment, it's almost impossible to tell what medium is on the other end of termination point.
Just curious what you SIP/Asterisk guys are doing to monitor for this to know when there is an outage besides your users calling you to tell you that's the case?