session initiation protocol
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.
ISDN is an acronym of Integrated Services Digital Network, which can be defined as a series of communication standards that allows the simultaneous digital transmission of data, voice, and other services over the public switched telephone network. The introduction of ISDN technology represented a move from analogue connectivity to digital, which offered significant improvements in quality. Although SIP (session initiation protocol) has been around for several years, it is only recently that advances in technology that have now made SIP an viable alternative to ISDN. The purpose of this article is to explore whether a business should replace ISDN with SIP.
A SIP trunk is the use of SIP (Session Initiation Protocol) to set up communications over the Internet between a customer location and an Internet telephony service provider (ITSP), which transfers the SIP calls to the PSTN. Unlike in traditional telephony, where bundles of physical wires were once delivered from the service provider to a business, a SIP trunk is a logical connection from one point to another over the Internet.