The 2010 edition of NFPA 72 allows a single, UL 864 listed TG-7FS to replace all of your customers existing fire panel landlines. The TG-7FS can serve as the sole communications path for commercial fire alarm systems, transmitting alarm signals from the fire panel over the digital cellular network to the designated monitoring station. On average, cellular monitoring costs the end user significantly less than a dedicated landline. Furthermore, each month they will pay you instead of the local telephone company for the communications path. For each landline they replace with a TG-7FS, their monthly communications bill decreases while your RMR increases.