I found that you have expertise in VOIP and have some good comments about your reliability.
I will explain my project in a basic manner though I know you an expert in the field. I am in Canada where international calls are expensive. But the country I was born, has low international call charges to canada. I want to develop a business providing international call back service this country. So that I can provide international calls to people living in Canada who want to call my country.
This program should be accessed though smart phones, web based (initiate the trigger from the web and connect the call to either a land phone or mobile), or from a regular phone (through a missed call or sms).
The program should have a calling card features. The user should be able to purchase credit through paypal or similar service.
In the program I need an address book for the user. When the user selects a number from the address, the system has to connect that number to the user. I dont want the user to receive a dialing tone to dial the number he wants.
If you are capable to handling this, I want your advice on all the equipments that would be compatible with your program. Further, I dont want to associate this business with any telephone in the country. I am planning to buy lines for business use. Therefore the whole business will be within my control. If I want to change the lines, I would be easily change the providers time to time.
If you are capable of handling this and give me a reasonable quote (I left the fixed amount as 30 as I am not sure how much it will cost), we can start the project in the first week of May.