Controlio asks: "With the explosion of cell phones, pay phones are disappearing quickly. I work in a large sports venue that seats over 60,000 - but has only 5 pay phones. The problem is the rent on those 5 phones is ridiculous - we net a loss of over $150 per phone per month. Its a great convenience for the public, but it'd be cheaper for us to have people stand in the middle of the stadium with cell phones saying "here, make a call for free." We have a great deal of both telephone and internet capabilities - we're a brand new facility and have far more than adequate data and voice pipes to our building. The question, is how can one roll their own payphone service? Has anyone done this? Where can you purchase equipment? What are the technical ramifications if we want to stay basic or get complicated with things like TTY or internet phones? Does VoIP or POTS make more sense? Any advice on where to get started?"