Support

Support

What is SIP Trunk?

Session Initiation Protocol (SIP) trunks are a digital method of connecting to phone calls and other digital communications over the Internet.
The term trunk in SIP trunking refers to a virtual phone line used to make phone calls to any phone number holder over the Internet.

SIP trunks are not only for voice calls, they can also be used for multimedia communications that include voice, video and messaging services.SIP trunks will replace SIP trunks will replace analogue and ISDN telephone lines, and many countries are already planning to discontinue the use of ISDN services.


Background on  the creation of SIP Trunk


1.Traditional Phone Network

In a traditional telephone network, as shown in Pic1, all internal calls are made through an internal PBX, and communications between the business and the outside world are made through trunk lines provided by the PSTN telephone operator.



2.SIP & PSTN

With the development of IP technology, more and more enterprises are deployingSIP-based IP-PBXs, as shown in Pic2, for internal calls. However, for external calls, enterprises still need to rent a trunk line from a PSTN telephone operator. The disadvantage of this type of network is that the enterprise needs to maintain both the SIP network and the PSTN network, making it more difficult to manage.



3.All IP Deployment

With the massive deployment of SIP-enabled IP-PBXs in enterprises and the increasing number of ITSPs (Internet Telephone ServiceProviders) providing voice communications infrastructure over SIP, there is an urgent need for as solution that can improve the quality of service.



(Internet Telephone Service Provider), there is an urgent need for a SIP trunking technology that can provide a trunk line similar to traditional PSTN trunks to connect enterprise IP-PBXs.


SIP trunk technology, similar to traditional PSTN trunking, is needed to connect the enterprise IP-PBX to the external Internet Telephone Service Provider (ITSP) for network-wide IP. A typical network diagram of which is shown in Pic 3.


SIP Trunk as a feature can be embedded in a gateway or firewall deployed at the edge of the enterprise network. Devices that can implement SIP Trunking are called SIP Trunking Devices, or TG Gateways.



Contact Us

New Rockers will do our best to support you
Contact with Us now

Copyright © New Rock Technologies, Inc. All Rights Reserved. 沪ICP备15008515号-1