Client need people to work on asterisk open Source. May be redeveloping asterisk2billing.net. Also client will need a website that will intereact with the asterisk server, where people buy credit with credit card, the site should also include a shopping cart. Also when people sign up they got an e-mail with their account details. The site admin will populate a Database with the account details thats where when people sign up the data is retrieve and mailed to them.
Payment term is 50% after project completed and tested by client and 50% upon deliver. Also six month support needed. Voip Knowledge here a must
If you not accept the terms plz dont bid.