Intellicom - Intelligent Communications
Intellicom Ireland

SIP Trunks

iStock_000001234764XSmallSession 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 can provide SIP trunks to customers whether they are already using our Intellicom ICP telephony systems or any other make or model of on premises Telephone systems ( including Microsoft Lync and Skype for Business ), regardless of age.

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.

With SIP trunking, subscribers can:

  • Initiate and receive local calls
  • Initiate and receive long-distance calls
  • Make emergency calls (999) * (note – Intellicom strongly recommend that all customers maintain at least one traditional PSTN or ISDN line to provide backup and support emergency service communications)
  • 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.