asterisk chat line/party line

looking for an asterisk based chat / party line, where you can call in, press 1 for male, 2 for female, get assigned a passname and passcode if you are a first time caller, or retrieve if you've forgotten (retrival by telephone number callerid)...once you are signed up, you are assigned trial minutes as a new member, with the option to purchase more minutes when your trial expires using an automated credit card processing system. once you are signed in, you can listen to other callers messages who are currently connected to the system and also send messages, and talk one on one if the callee authorizes the invitation. looking to store the messages in ODBC/mysql database with the ability to record your name, a greeting and general message for other callers who are connected to the line. this is the jist of it. would prefer mysql. already have asterisk server & mysql server set up (asterisk 1.4x)