What Is SIP Trunking?
SIP trunking, or session initiation protocol trunking, is the use of voice over Internet protocol (VoIP) to enable a connection between the private branch exchange (PBX) and the Internet. SIP trunking performs essentially the same job as traditional telephone trunking, but in a new, modern way. SIP trunking connects private IP PBXs located remotely over the IP network. This creates a virtual private network (VPN) connection between the two lines. So, users in one location can make and receive calls from users in a different location without any additional costs or fees since the calls are technically made within an existing network.
What Is Trunking?
A trunk is a line that can carry many signals at one time. Telephone trunk lines essentially allow users to make and receive phone calls within a business. To get an image of this, imagine working in an office with your very own IP telephone. There are many other phone users in the building as you, and you are all connected to one IP PBX, which directs calls. As you proceed to make an outgoing phone call, the request reaches the PBX, which in turn connects your call to an available trunk line connected to the PBX. SIP trunking utilizes this same process: an incoming call reaches the PBX, which routes the call to the correct extension.
What Are Benefits of SIP Trunking?
At the most basic level, SIP trunking allows businesses to communicate with landlines and mobile phones around the world. This service combines data, voice and video in one single line, eliminating the need for separate media for each mode. Ultimately, SIP trunking results in a lowered overall cost for the company while enhancing dependability for all multimedia services.
Features of SIP Trunking
SIP trunking offers many features, including:
- Ability to make and receive local and long distance calls
- Ability to make emergency phone calls
- Access directory assistance
- Allows use of fixed or mobile telephone sets
- Email and texting ability
- Internet browsing ability
What You Need for SIP Trunking
For your business to have SIP trunking you need:
- PBX that connects to all internal end users
- An internet telephony service provider (ITSP)
- A gateway that serves as the interface between PBX and IISP