Internet+: SIP Trunking Your Unified Communication

Ask the SIP Trunk Expert

Internet+: SIP Trunking Your Unified Communication

By TMCnet Special Guest
Karl Erik Stahl, CEO at Ingate Systems and Intertex Data AB
  |  June 04, 2012

This article originally appeared in the June 2012 issue of INTERNET TELEPHONY

Connecting the telephony of the enterprise PBX (News - Alert) or UC system using IP SIP trunks instead of conventional telephone lines has been very successful in recent years. Now it is time to utilize the full power of the global IP networks and our UC terminals – PCs, laptops, fixed and mobile phones, tablet computers and telepresence systems – to extend the telephony service with high-quality, full UC capability, where everyone reaches one another using both telephone numbers and email-like SIP addresses.

Internet+ is a model proposed by Ingate and its sister company Intertex (News - Alert), where telcos offer UC federation between all users as an obvious continuation/extension of the telephony service. Today your unified communication is local, and you have to do special federation using E-SBCs (enterprise session border controllers) like those of Ingate to use UC beyond your own island, if at all possible.

Today’s SIP trunks only connect the voice telephony service, since that application is built into the telcos’ networks (SDN or IMS networks). In the Internet+ model, the telco service providers will instead be responsible for delivering general SIP connectivity over quality IP paths all the way to the users, for all kinds of real-time person-to-person communication, such as voice, video, presence, IM and whatever one can imagine using the SIP standard.

The Internet+ model is remarkably simple to implement, by using intelligent E-SBCs at the border between the public IP transport network and the private network, typically an enterprise LAN. Those E-SBCs fulfill TOQrouter (Trust, Openness, Quality) functions of routing, classifying, billing, prioritizing, NAT/firewall traversal and security for the calls and messages.

The telco infrastructure benefits from using the bandwidth already available in the IP networks, which today is used only for unprioritized and uncharged data traffic. Since routing and billing is done at the edge, Internet+ leverages the built-in reliability and scalability of IP networks – something that is lost (and expensive to regain) in SDN and IMS networks.

The telco infrastructure therefore becomes easy to implement, reliable, scalable and very cost efficient, only costing a fraction of today’s SDN or IMS networks.

The Internet+ model also applies to smartphones on 3G and 4G networks. Here, the TOQrouter simply replaces the firewall for the Internet access channel in the service providers’ networks.

Download the Internet+ brief at and

Edited by Braden Becker