An Introduction to SIP Trunking

Posted by Sam Mountstephens on Nov 16, 2017 12:15:00 PM

Session Initiation Protocol (SIP) trunking is a method of delivering voice communication over the internet. Unlike a standard telephone line or ISDN (Integrated Services Digital Network), SIP trunks rely on a reliable business internet connection to place and receive calls. Some of the common benefits associated with SIP trunking include lower costs, scalable setup options and improved reliability.

The Basics

SIP trunking utilizes VoIP to operate over the company’s internet connection. This removes the need for a physical connection to a phone company or service provider. No hardware, wires or circuit boxes are required to establish and maintain a connection to the provider or the PSTN (Public Switched Telephone Network). A SIP “trunk” is placed over a company’s existing internet connection, removing the need for analog phone lines.

The foundation of SIP also highlights the requirement of a stable and secure internet solution. While cable and DSL can support SIP trunking, companies may want to consider higher bandwidth alternatives that can be scaled to accommodate changing needs. Fixed wireless is a cost-effective solution that is becoming more widely available.

Consolidation Leads to Cost Savings

SIP trunking can help to connect employees with enterprise-wide phone systems

By consolidating multiple phone lines to one single point of entry, companies experience a significant reduction in line charges and the maintenance associated with those lines. Similarly, the cost of a phone number, or Direct Inward Dialing (DID) number, is less expensive when purchased with a SIP trunk.

This is because there are no infrastructure costs relating to IT and maintenance services and there is no need to purchase the hardware required with traditional systems.

As high-speed fixed wireless and fiber internet access continue to grow, businesses will continue to adopt SIP trunking due to the flexibility it offers and the way that traffic is managed.

Catalyst for Unified Communications

VoIP and SIP allows companies to develop unified communications solutions that integrate voice, video and data at a far lower cost than had been possible when multiple lines were required.

This streamlining of multimedia applications and communication platforms through cloud-based technology facilitates productivity and efficiency in the workplace.

Before migrating to SIP trunking, organizations must ensure that they are prepared for unlikely security vulnerabilities, from SIP floods to toll fraud. In addition, it is important to understand the impact that SIP trunking will have on the network’s bandwidth.

The Next Step

Is your business ready for SIP trunking? Contact One Ring Networks to find out how our team can help! You can reach us at 404-303-9900 or email


Topics: VoIP, SIP trunking