Editorial Note: We earn a commission from partner links on Forbes Advisor. Commissions do not affect our editors' opinions or evaluations. A private branch exchange (PBX) is a telephone system ...

"I have been completely happy with SBC," she said. It used to be that Pacific Bell Telephone Co. (now SBC) was the phone company Northern Californians loved to hate. But increasingly, customers ...

Watson, over a two-mile distance on the first telephone call, the connection used a ring-down circuit ... either per user or per extension. Integrating an existing phone system with a VoIP ...