[Asterisk-Users] Detecting when a called mobile is not reachable?

[Ian Hailey]

Hello all,

I was hoping to be able to call a mobile and if it is un-reachable for 
whatever reason (e.g. switched off) then I was expecting an unobtainable 
response that would be detected in Asterisk. It seems that the operator 
(Virgin in UK) imedately completes the call and plays an automated 
message before clearing the call. Does anyone know if there a way of 
avoiding the call completion for mobiles? I have noticed that Sipgate 
charge for a calls to an unavailable mobile regardless.

Thanks.

Ian.