SIP Trunks and SIP Channels
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.
A SIP channel is the capability to support one incoming or outgoing call.
SIP channels are sometimes called sessions, lines or concurrent calls.
How many channels are in a SIP trunk?
What does SIP trunk mean?
Session Initiation Protocol (SIP) trunking is a service offered by a communications service provider that uses the protocol to provision voice over IP (VoIP) connectivity between an on-premises phone system and the public switched telephone network (PSTN). SIP is used for call establishment, management and teardown.
What is a SIP trunk used for?
SIP Trunking uses Internet Protocol (IP) to enable organizations to place telephone calls through the Public Switched Telephone Network (PSTN). SIP trunking technology requires either an Internet connection, or a VoIP vendor, an IP-enabled PBX, and a border element or gateway to support IP-based voice communications.
How many SIP trunks do I need?
When the question “How many trunks do I need?” comes to mind, for most vendors, they’ll rather stick to the old rule of thumb — one trunk for three employees. For others, they take it as duplicating the current number of trunks you’re using (in cases where it applies).