SIP, short for Session Initiation Protocol, is an application layer protocol that lets you run your phone system over an internet connection instead of traditional phone lines. Trunking refers to the backbone of phone lines used by multiple users that connects to a telephone network.
Choosing a Wholesale SIP Provider
SIP Trunking The modern alternative to the ISDN system is SIP trunking. Like PRI, SIP trunking connects your internal PABX to the PSTN. Although, ...