Hi there I need a quote for the following customization for a2billing.

First I will explain my scenario for you to understand my idea.

I have 2 servers with trixbox 2.6 on diferents locations. One of them has a2billing and the other is my call destination for my customers. The problem is that the bandwith between them is very low in peaks hours and only 1 simultaneous call is possible. during not peak hours 2 simultaneous calls are available.

What I want is to do a customization to a2billling or asterisk do the following
when there is 1 call in progress and a second caller goes into a2billing. The second caller will setup a regular call but at the moment of place the call if there is 1 call in progress in that trunk the system will play a sound file and schelude the call for later when the line is available. When the line is available the system will callback the customer trough a system trunk and will play a sound file for example "Do you still want your call to be placed press 1 to place the call or hung up" if pressed one the system will connect automatically with the number he previous dial in the previous call.

NOTE
I want to be able to ad anothers trunks with this characteristic in the future.

I want to setup a voice broadcast system.
my goal is to call for example 100 phone numbers and play a voice msg if posible select my caller id, I dont know if this can be done with campaings in a2billing.

Any sugestions are welcome????