Hi Tony -
I am needing the same thing. In short, the answer is no. the only way you can reliably detect answer supervision is :
1) Line reversal from the telco or PBX. I think BT will provide reversal on answer if you request it as some payphones need it.
2) Meter pulse. This starts from the point the call is charged, i.e. answer supervision. BT charge an arm and leg for this and they are phasing it out anyway as payphones rely on built in tariff tables and line reversal.
3) Our old friend ISDN. Perfect.
for busy, busydetect=yes is pretty good on analogue lines.
In the mantime you can use the c option in the Dial command to force the user to answer the call by pressing the # key. There is a new feature request http://bugs.digium.com/bug_view_page.php?bug_id=0002356 that relates to this to play a message rather than silence to the called party to indicate that some action is required on their part to accept the call.
Rgds Tim Basingstoke
Tony Mountifield wrote:
I've just been doing some tests using the manager API to originate an outgoing call via a X100P and connect the call to an extension:
Action: Originate Channel: Zap/1/01234567890 Context: local-extensions Exten: 6000 Priority: 1
I've noticed that extension is getting called as soon as the outgoing call has been placed, rather than when it is answered.
Is the X100P capable of detecting when the call has been answered? If not, can the FXO module for the TDM400P do so?
What about detecting busy or congenstion?
I'm on a BT line in the UK, if that is significant.
I will soon be doing the same thing over a T1 or E1 line instead. Can I be sure that answer will be correctly detected in that case, and that the internal extension won't be called until that happens?
Cheers
Tony
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