Session Initiation Protocol (SIP) trunking is the use of voice over IP (VoIP) to facilitate the connection of a telephony system (known as a private branch exchange (PBX)) and it’s users to a Public or Private IP WAN link and typically linking on to Telecoms service provider, such as Intellicom, for inbound and outbound call routing and termination.

In effect, the IP WAN link replaces the conventional PSTN or ISDN telephone trunk, allowing an enterprise to communicate with fixed and mobile telephone subscribers worldwide. SIP is an IETF standard for initiating interactive multimedia user sessions; a trunk is a line or link that can carry many signals at once, connecting major switching centres or nodes in a communications system.

In order to take advantage of SIP trunking, an enterprise must have a PBX (Telephone System) that connects to all internal end users (either IP based or traditional Analogue or Digital system), an IP telephony / VoIP service provider and an appropriate gateway device that serves as the interface between the PBX and the service provider. Intellicom specialises in the provision of all of these elements within a single seamless service to our end customers.

We provide intellicom | inflow SIP trunks to customers whether they are already using our Intellicom | intune telephony systems or any other make or model of on premises Telephone systems (including Microsoft Lync, Skype for Business and MS Teams), regardless of age.

MS Teams Direct Routing and call termination (MS Certified SBC infrastructure)              

MS Teams PBX integration to Intellicom | intune PBX & Contact Centre solutions           

One of the most significant advantages of SIP trunking is its ability to combine data, voice and video in a single line, eliminating the need for separate physical media for each mode. The result is reduced overall cost and enhanced reliability for multimedia services.

- Initiate and receive local calls
- Initiate and receive long-distance calls
- Make emergency calls (999)*
- Access directory assistance
- Use fixed and mobile telephone sets
- Employ e-mail and texting
- Browse the World Wide Web.
SIP trunks can be deployed through existing Internet links (a logical circuit within the main link) or can be a dedicated IP WAN connection specifically used for voice and video communications. In both cases using a SIP trunk can result in the end customer cancelling the traditional line rentals associated with existing PSTN and/or ISDN lines servicing their on premises telephone or call centre systems and so add to the considerable monthly cost savings that our SIP trunk based low cost voice rates can provide.

In some cases a Session Border Controller (SBC) may be needed to provide number, protocol and/or code translations or transcoding or also to provide additional security and/or additional telephony features. intellicom | infuse SBC is a software or hardware based SBC solution providing many standard SBC functions and any additional feature enhancements to your existing 3rd party Telephony or Call Centre solution.