This third-party provider will then complete the call to the recipient. The session initiation will then be redirected to a second SBC, dedicated to the provider which holds the chosen route. Indeed, one single call could take an infinity of different “routes” (through one operator or another) to reach its destination. The signal then arrives at the Proxy, which compares all the potential routes and chooses the most adequate one. If one of your users makes a call, the SIP session (session initiation) will pass through your gateway (or Centrex), will then be transmitted to the provider’s SBC (Session Border Controller) which will serve as a filter, for a matter of security. You can then benefit from its call rates in your country and internationally. a router) or your PBX to its infrastructure (its core network in telecom terms). If you are using a provider, the latter will connect your “voice gateway” (i.e. More precisely, how could we break down a Trunk service ? Via this PBX, you can assign a number to any phone or employee. These numbers will then be linked to your PBX. Skype or Zoom heavily use this protocol.ĭespite all this, among all the options available today, SIP Trunking is the dominant service for fixed telephony.įinally, to complete the jigsaw: you need numbers. Web RTC (RTC stands for "Real-Time Communication") is another way of carrying voice over the internet, using your web browser. We talk about this at greater length in the white paper “ The end of PSTN". In the UK, BT has recently decided to end it (with an horizon of 2025) in favor of VoIP, which is more suited to modern usage. However, all around the world, its disappearance beckons. For a long time, this was the dominant telephone network. PSTN, for example, is the name given to copper-borne, analog telephony (stands for Public Switched Telephone Network). Note that there are other fixed telephony formats. In other words, the IPBX is the base of the Trunk.
As it is at the center of the company's network, SIP Trunk providers will generally connect to their clients at the IPBX level. It helps the IT team to manage their phone fleet and their users scenarios (like forwarding a call, editing a voicemail, changing a number). Telephony-wide, it is the entry point to the company. The Internet Private Branch Exchange links the employees' phones between themselves. IPBX: Most companies now have what we call an IPBX.
The calls will then be carried to their destination. The term “trunk” is a metaphor illustrating the fact that all the telephone lines join up at a single point (the provider’s infrastructure) and follow a long channel, hence the trunk shape.
SIP Trunk: a SIP Trunk is the concept of collecting the calls of a set of phones on a single infrastructure (the one of your telephony provider). In a way, SIP enables a VoIP call to happen. SIP: the Session Initiation Protocol is a protocol used to initiate, maintain and complete telephone calls on VoIP. VoIP: Voice over Internet Protocol designates telephonic communications carried out over an internet connection, in contrast with communications established using traditional telephone lines (called analog telephony). In order to explain what a SIP Trunk is, it is first necessary to introduce the concepts of SIP and VoIP.
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