Free Essay

Networking Sip Trunking

In: Computers and Technology

Submitted By sbontiff
Words 576
Pages 3
Introduction
SIP which means Session Initiation Protocol is used for signaling system for connecting, monitoring and disconnection multimedia and voice based communications sessions over the internet. Internet Engineering Task Force defines SIP as “Peer-to-peer multimedia signaling protocol that integrates with other internet services to deliver rich communications”.
Definition
SIP trunking means that the IP media streams that are transmitted from within an enterprise remains an IP Media stream and passes to anywhere else within the enterprise or to across the boundary of the enterprise to another enterprise via Internet protocol. In other words, a SIP trunk is the digital data transmission link with SIP protocol which signals interfaces recognizing SIP signals and SIP media protocols using the Real Time Protocol (RTP) for voice transmission (media) and Real Time Control Protocol (RTCP) and Quality of Service (QoS). This setting reduces the need to be dependent on a local telephone system by employing hardware media gateways at the carrier edge and the enterprise edge and results in significant savings for the enterprise. This is often referred to as the PSTN-Public Switched Telephone Network) In addition to this, further cost savings is possible by cutting down on the expensive telephone desk sets that are used in many offices across the globe by introducing intelligent softphones in its place and eliminating expensive SDN Basic Rate Interfaces (BRI) and Primary Rate Interfaces (PRI).
Components of SIP trunking
To deploy an SIP trunk the following three components are necessary: a PBX with a SIP enabled trunk side: PBX is an Internet Telephony based PBX that communicates with all endpoints over an Internet Telephony and it can be both the modern digital PBX and the analog PBX. The only requirement is that the interface for SIP trunking connectivity should be available.
An Enterprise edge device which can understand SIP: The LAN enabled PBX connects to the ITSP via the Enterprise edge element. The enterprise edge component can be both a firewall enabled with full support for SIP or simply an edge device which connects to the firewall and handles to the transversal of the SIP traffic.
Internet telephony SIP trunking service provider: ITSP provides connectivity to the Public Switched Telephone Network for communication with cellular and landline phones.
Benefits of SIP trunking
There are additional benefits of SIP trunking apart from the ones already covered above:
It facilitates optimum utilization of bandwidth by combining both data and voice in the same connection
It provides maximum flexibility for the usage of lines by eliminating the need of buying capacity in chunks of 23 (T1) or 30 (E1) lines
It facilitates flexible termination of calls to preferred provider which means international call can be made with the cost of a local call.
SIP trunking enables redundancy with multiple service providers and links.

RFC and SIP trunk
For SIP, RFC - 3261 is defined but if we go explicitly for SIP trunk, no RFC is clearly mentioned. Though the third party component on which success of SIP depends are compliant with some RFCs.

Works Cited
Lync, M. S. (2011, 09 22). SIP Trunking in Deploying Lync: Advice. Retrieved from http://www.telecomreseller.com: http://www.telecomreseller.com/2011/09/22/sip-trunking-in-deploying-lync-advice/
Magnusson, J. (n.d.). SIP Trunking Benefits and Best Practices. Retrieved from http://www.ingate.com: http://www.ingate.com/files/white_paper_What_is_SIP_Trunking_A.pdf
SIP Trunk. (n.d.). Retrieved from http://www.siptrunk.org: http://www.siptrunk.org/whatissiptrunking.php…...

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