What is sip trunking ?How its works equipment?

Session initiation protocol (SIP) trunking has become an essential part of network connectivity in any enterprise ,it is the use of voice over IP (VoIP) to facilitate the connection of a private branch exchange (PBX) to the Internet
In effect, the Internet replaces the conventional telephone trunk,allowing an enterprise to communicate with fixed and mobile telephone subscribers worldwide.
sip trunking is a service offered by an Internet Telephony Service Provider (ITSP) that converges voice and data onto one communication line,It enables you to extend VoIP telephony beyond your organization's firewall without the need for an IP-PSTN gateway.This simpler configuration is easier and less expensive to design.
Deploying SIP trunking can be a big step towards simplifying your organization's telecommunications and towards preparing for the latest real-time communications enhancements.

There are four components necessary to successfully deploy SIP trunking
1)-PBX with a SIP -enabled trunk side
2)-enterprise device understanding SIP(EDGE)
3)-Internet telephony or SIP trunking service provider(ITSP)
4)-Public Switched Telephone Network (PSTN)
1)-PBX :
PBX (Private Branch Exchange) is a switch station for telephone systems owned by a company or organization,it is a private telephone network used within a company. These organizations purchase PBX's to reduce the total number of telephone lines they need to lease from the telephone company.
Companies use a PBX for connecting all their internal phones to an external line. This way, they can lease only one line and have many people using it
A PBX reduces cost because the company only pays for the number of lines liable to be connected at any given time to the outside

 3)-ITSP:Internet Telephony Service Provider,Also known as VOIP Service Providers, offers an Internet data service for making telephone calls using VoIP,
 4)-PSTN:Public Switched Telephone Network. Réseau téléphonique public commuté (RTC).it is the entire telephone system, except for private telephone systems which are managed by their own PBX.


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