An organization that provides voice over IP (VoIP) service and enables calling from SIP phones to plain-old-telephone (POTS) lines and vice versa. SIP is the universal protocol used for Internet ...

Many companies continue to rely on traditional phone systems, including trunk line telephone setups, to connect with clients ...

Discover the best SIP trunking providers and how to choose one in our complete buyer’s guide. I’ve looked into just about every business phone system on the market. Along the way, I uncovered ...