Difference between Pri Trunk & Sip Trunk – GSM Gateway
A PRI Trunk (Primary Rate Interface) is a traditional telephony connection that uses physical E1/T1 lines to connect a business PBX to the PSTN, offering 23 (T1) or 30 (E1) channels for voice calls. SIP Trunk (Session Initiation Protocol) is a modern, internet-based telephony service that connects a PBX to the PSTN via VoIP, offering flexible, cost-effective, and scalable communication.