Netw320 Week 3 Assignment Essay

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DeVry University NETW-320: SIP Trunk Submitted to: Professor: Date: 3/23/2014 This week’s assignment is discussing what a SIP trunk is, why you would use a SIP trunk, the equipment required for its use, and any RFCs that cover SIP trunking. The Session Initiation Protocol (SIP) is a signaling communications protocol, widely used for controlling multimedia communication sessions such as voice and video calls over Internet Protocol (IP) networks. SIP trunking over SIP trunks is a service offered by carriers and Internet telephony service providers that allows businesses to use voice over the Internet protocol across their Internet connection. It is used to extend VoIP or IP telephony use beyond the enterprise network. Essentially, it provides direct IP connectivity to an IP-PBX or call/communications manager and permits VoIP-enabling an enterprise’s legacy PABX, via a gateway. It may also be used outside the enterprise network to provide functionality for home workers or other remotely located staff. The protocol defines the messages that are sent between peers which govern establishment, termination and other essential elements of a call. SIP can be used for creating, modifying and terminating sessions consisting of one or several media streams. SIP can be used for two-party (unicast) or multiparty (multicast) sessions. Other SIP applications include video conferencing, streaming multimedia distribution, instant messaging, presence information, file transfer, fax over IP and online games A SIP trunk allows a company to achieve PSTN connectivity indirectly via its service provider or an ITSP. This eliminates the need to own and maintain PSTN gateway hardware for an IP- PBX. And importantly, SIP trunks offer significant cost savings compared with the cost of traditional fixed PSTN lines; ISDN basic rate or primary rate interfaces (BRI/PRI). SIP trunks

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