SIP trunking is an alternative way of connecting on premise customer equipment (such as PBX, communication gateway, etc.) to the Public Switched Telephone Network (PSTN) or telephone network in short.
SIP trunks differ from the traditional network by leveraging internet protocols to create a flexible and cost effective highway between a customer’s PBX and the global telephony network without the need for new infrastructure. SIP trunking is built based on widely accepted Internet Protocol (IP) technology and utilizes Session Initiation Protocol (SIP) to control connection management.
As an IP based solution, SIP trunking benefits from the underlying technology, existing IP infrastructure and cost models. It offers:
- Easy and flawless integration with other IP/SIP based applications.
- Simplification of deployment and management of solution.
- Rich set of new capabilities and features (Instant Messaging, Multimedia Conferencing, Presence info, etc.); high redundancy, high availability and location independence (often called disappearance of distance).
- Lower cost of voice transport.
Switching to a SIP network allows for the deliverance of many features between the on-site PBX and the telephony network. You are no longer limited to the infrastructure you have on-site.
As the SIP trunk provides an alternative connection of customer’s PBX to the PSTN, it is totally transparent to end users, which continue to use their existing telephones and favorite business features they are so used to.