What Is a SIP Trunk?
A SIP Trunk is a VoIP (Voice over Internet Protocol) service which streams media based on the Session Initiation Protocol. SIP is often used to control voice and video calls or other communication sessions over Internet Protocol. The protocol can be used to both create and terminate sessions, or modify them whether they be unicast or multicast or over one or several media streams. Instant messaging and online games also use SIP.
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