A SIP trunk is simply the connection between your phone system and the public switched telephone network. Think of it as a tunnel for a highway. Ais the capability to support one incoming or outgoing call. SIP channels are sometimes called sessions, lines or concurrent calls.
SSAIB, ATSVR, ISDN2e, ISDN30e, EN54-25, FREE Minutes, ISDN, PSTN, ACD Agent, IP PBX, SIP channel, NGN numbers, CAT5e and CAT6 cabling, VoIP, 128-bit AES encryption , 256-bit AES encryption, BS 5839, EN-50131, ISO 9001, 2015 compliant , BS 7858 , SiA