Is there such a thing as a base unit with optional handsets either wired or wireless with up to 3 lines? I work in TV and was exploring the idea of a system that can be hardwired in our production truck and used when landlines are not present. It would also give you the option of relocating the master antenna in places or poor reception. I have know idea if this kind of system exists. Any help?

See More: Multiple line cell phone systems?