Quoting A J Stiles <[email protected]>:
On a BT line, how do I determine whether the number on an incoming call has
been deliberately withheld (by dialling 141) or is merely
unavailable (e.g.
because it originated from overseas or passed through some ancient switching
equipment) ?
In the first case, I want the caller to be played a message to the
effect that
we are not at home to anonymous cowards but if their business is important,
they may redial without withholding their number. In the second case, the
call needs to be treated as legitimate since it is not really the caller's
fault that their number is not available.
Software is Asterisk 1.8.5.0 with DAHDI 2.4.1.2. Hardware is
TDM410P with two
each FXO and FXS modules.
Assuming caller ID works reliably for you - it's not been so for me
since I got an AEX410 - the CALLERID(name) will provide the
information. On withheld calls, it may be blank or the word "WITHHELD"
or even the CALLERID(num) could be "Withheld". The CALLERID(name) is
"UNAVAILABLE" where equipment age or similar affects the situation,
and "INTERNATIONAL" for calls from overseas.
It also gets set to "RINGBACK" for ringbacks, of course.
--
Phil Reynolds
mail: [email protected]
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