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 ...

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 ...

The gateway then sends this information to the SIP provider over the internet. The SIP provider connects the call to the other party, whether using a traditional phone or another SIP trunk.