Web Interface - Asterisk / A2Billing

Project Description (1) The available Server Configuration: Asterisk 1.6, FreePBX 2.8, A2Billing 1.9 (2) The contemplated Service to be launched: We want to offer SIP Accounts & European DIDs configured in Wi-Fi / cable SIP Phones to customers in our area. Customers can be constantly reached on their DID by receiving incoming calls but in order to initiate outgoing calls, they need to purchase credit online. The intended SIP Telephony service is on pre-payment basis only, this means, If the customer’s credit balance is zero then they cannot initiate any more outgoing calls. Therefore customers must be able to purchase credit online. The system must be configured in a way to announce the balance left after each initiate outgoing call, comparable to pre-paid calling cards. (3) Configuration needed: We need a Freelancer to assist in configuring the following: (a) SIP Trunk for the Incoming Calls in FreePBX (b) SIP Trunk for the outgoing calls in FreePBX (c) Define the incoming and outgoing routes in FreePBX (d) Configure and set-up the A2Billing entirely in a way to start selling the service. (4) PHP Web interface needed: (a) a PHP Web Interface for our Administrator to: (i) enter customer information details, (ii) assign a SIP extension, (iii) assign a DID to the customer and (iv) activate / deactivate the service. This interface must properly communicate with the FreePBX and the A2Billing