What is a company's role in SIP Trunking?

Posted by Shawn Guenther, Vice President of Product Management & Development

Find me on:

May 21, 2015; 5:56 PM

More companies are switching to SIP Trunking to tap into its wealth of benefits.  A crucial element to enabling unified communications for many firms, SIP Trunking increases mobility, productivity, savings and communication reliability. 


However, SIP Trunking requires a new level of understanding of the technology in order for a business to reap the full benefits. In order to get the most out of these applications, companies must understand the role they, as the business, play in cultivating SIP Trunking in the workplace.

Evaluate compatibility
If companies plan to run SIP Trunking over the Internet, they must first determine if their bandwidth is large enough. The network should also be evaluated on whether or not it can handle the different voice applications of SIP Trunking. Enterprise organizations should speak with their SIP provider to better understand how their equipment and network will best function with SIP Trunks.

Enhance security
Passwords are a major contributor to enhancing SIP Trunking security. A good practice is for companies to require complex authentication for both incoming and outgoing calls. To combat dangers like toll fraud, companies should especially require authentication for international calls.

No Jitter contributor Matt Brunk stressed that it's up to enterprises to make sure they maintain security in SIP Trunking. He suggested they lock down the firewall and maximize security by setting access control lists that only accept SIP traffic from the provider's IP address and ports the company already uses.

Brunk also suggested putting some separation between SIP Trunks. Instead of having all ports go through all LANs, companies can go in and only allow access from specific ports to specific LANs. The bottom line is that multiple levels of defense will optimize SIP Trunk security.

Learn about cost savings
Additionally, No Jitter contributor and Program Co-chair of the Enterprise Connect events Eric Krapf recently discussed how Gartner research director Sorell Slaymaker sees SIP Trunking as a huge 
cost-savings tool. In fact, Slaymaker said enterprises can save up to 50 percent over their Primary Rate Interface (PRI) bill. This savings happens because the charges are more simplified now that carriers are moving to a single rate for long distance calls.

In addition to PRI prices bringing lower costs, Ethernet access services costs are also falling, bringing out another form of cost-savings with SIP Trunking. The pooling method enterprises use to pay for usage eliminates the chance of overpaying. Though this method, companies can pay for the total usage across all sites rather than paying for each one individually. Knowing this cost-saving information will help companies get the most financial benefits from SIP Trunking.

ESI delivers SIP Trunking services through a network of certified resellers.  Implementing SIP Trunks on an existing on-premise solution is often considered an on-ramp to the cloud and an opportunity to experience some of the benefits of a VoIP solution.  

We find that our customers typically save up to 50% in cost savings from their existing phone services – give us your communications bill and we will show you just how much you could be saving! 


Topics: Cloud Communication, Voice over IP (VoIP), SIP trunking, Unified Communications (UC)