Dial Telecoms Pty Ltd Telecommunications Billing Program. Extract call detail remotely by logging into GSM racks with multiple SIM cards. Combine with call detail from different GSM Networks. Produce customer invoices showing Number dialled,, duration and cost of each call, and total cost. Savings against dialling from land-line operator Telkom shown call. Most frequently dialled numbers and most expensive calls shown for each customer. Approximately 50,000 pages of call detail with about 2,000 seperate invoices produced monthly.