Originally Posted by John Clark
You have to purchase for one or the other. I believe they have both, though. I purchased a dual band GSM system with 3 inside repeaters for an office building 850Mhz and 1900Mhz. The dual band setup was costly--$3000. However, the single band systems were much cheaper.
They do require decent signal outside in order to work properly. We've had it installed for over two years with not a single minute of downtime (unless the power goes out.)
cool signal outside is marginal at best so maybe I wont waste my money.