[asterisk-users] billed calls when cellullar phone is unreachable

[Andreas Sikkema]

> When we route a call to an unreachable cellular phone we know 
> it cause 
> we get a particular ${HANGUPCAUSE} so we don't bill that call even if 
> billsec is > 0 (the duration of the "cellular is unreachable bla bla" 
> message),  but the customer says their system too records the 
> call as > 
> 0 and their expected behaviour is to have the call recorded 
> as duration 
> == 0.
> (I'm supposing the customer is noticing the cellphones cause 
> of the high 
> traffic, but probably this happens also with other kind of "service 
> messages" which aren't to be billed, have to try)

I would expect these kind of messages to be played without 
"answering" the call. IIRC on ISDN this is done using a 
FACILITY message with a "start audio" IE included (I'm not 
that much into ISDN to be more precise).

On H.323 this is called "early media" and in SIP this would be 
signalled using a 186 Session Progress message.

-- 
Andreas Sikkema                       BBned NV
Software Engineer                Planeetbaan 4
+31 (0)23 7074342            2132 HZ Hoofddorp