Hi All I would like to write some type of billing program that will collect the charges for each account monthly When someone calls into the (freeswitch) conference by dialing toll free number or local number and enters PIN number the program will recognize that and start collecting number of minutes and number of persons dialed in and calculate the amount of dollars. Lets say conference is 10cent/per minute /per person for a tool free number Each time people dial into conference it will calculate total amount by person and by minutes, and generate monthly billing. The PIN numbers may be different for conferences that belong to same account. How would I do such thing? Where do I start from? Is there any sample programs like it somewhere out there Which language would be best to it with I would pay for any professional services Thanks in advance deniro--