[asterisk-users] allowing call to my pabx every 15 minutes

[Goke Aruna]

Hello all,

I have a set up that answer my customer. and its working well,

however, the number of call to technical dept is what i want to reduce.

I want all call to get to voice prompt except that that enter when
minutes is 15, 30, 45, 60(in multiples of 15 minutes).

how can i achieve this and what application can i use to get this done.

I will be glad, if someone can give me a hint on this.

Goksie