[Asterisk-Users] Playback(something,noanswer) on Zap?

[Dmitry Ivanov]

Hi!

Our telco routes multiple numbers through PRI to our Asterisk. Not all 
of these numbers are in use. I have noticed recently that someone keeps 
calling unused phone number from outside world. I called them and asked 
why do they call dead number. The person on the far end explained that 
she keeps calling this number because she hears "busy" tone every 
time...

Most telcos these days provide verbal in-band notification in case if 
number does not exist. Those nice female voices. People do expect this 
behaviour from their phones. People no longer accept beeps as "number 
does not exist" signal. 

First thing I've tried was Playback(invalid). The problem was that 
asterisk answered incoming call. This should not happen when caller 
does not reach his/her destination.

Next, I tried Playback(invalid,noanswer). This time, Asterisk did not 
answer the call. But there was no sound!

Apparently, Playback(invalid,noanswer) does not work with Zap/PRI. Is 
this bug?