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SIP Trunking | Complete Guide to Session Initiation Protocol

As technology continues to advance, we’re seeing major industries go through complete transformations. This is especially true in the telecom space, where businesses are constantly looking for new ways to improve the way they communicate.

At the forefront of telecommunication, we’ve seen a dramatic shift away from the traditional. In particular, businesses are opting out of physical phone lines and some of the limitations they present, and finding more productivity with internet based communications.

If you’re new to the world of telecom, we’re going to break down what SIP Trunking is, and why you may want to consider it as a voice solution for your business.

What is a SIP Trunk?

At the most basic level, SIP Trunking refers to the method of operating a phone system over the internet rather than using a traditional telephone line. For businesses, SIP Trunking offers far more flexibility and scalability than its counterparts.

If you’re interested in learning more, follow along as we break down exactly what SIP Trunking is.

SIP Trunk Setup

If you’re ready to take the next step, we’ve got you covered. At Telnyx, Elastic SIP Trunking is enabled using SIP Connections and Outbound Voice Profiles. Once your connection is established, you’ll be able to instably scale at a global level.

The complete Telnyx SIP Trunk setup guide.

SIP Trunk vs PRI

For business owners, finding the right call solution often seems like an uphill battle. So, when it comes to choosing between SIP Trunking and PRI, there are definitely some things you’ll need to consider. First, it’s important to understand the difference between the two.

PRI stands for Primary Rate Interface, and is used to deliver voice calls over physical copper lines. Typically, these lines are part of your building’s infrastructure.

SIP Trunking, on the other hand, is a more modern approach to voice that initiates and ends calls over the internet rather than physical lines.

Learn more about which option best fits your business needs with our SIP Trunk vs PRI guide.

SIP Trunk vs DID

Since SIP Trunking connects to the internet rather than a traditional phone line, it makes sense that you’ll need a virtual phone number to place your calls. That where your DID number comes into play.

DID stands for Direct Inward Dialing, and is a virtual number that connects to a specific phone. For businesses, DID’s allow you to scale up your phone numbers without the need for tons of extra physical phone lines. In turn, it creates a seamless user experience for both customers and employees.

To learn more about, check out our complete SIP Trunk vs DID guide.

What is a SIP Trunk Channel

Like traditional phone lines, a SIP Trunk channel is the line for a single call on your SIP Trunk. The more calls you want to make, the more channels you’re going to need.

The key difference between traditional phone lines and SIP Trunk channels is adding more channels doesn’t require adding more physical lines or wiring. SIP Trunk channels can be added virtually, which make it easier for you to scale. Ready to learn more?

Check out our complete guide to understanding what a SIP Trunk channel is.

Inbound SIP Trunk

As the description suggests, inbound SIP Trunking refers to calls placed from an external source to an internal source. And yes, it differs from outbound SIP Trunking in regards to a few key features. For example, companies will often use voicemail and call routing for their inbound SIP Trunking needs.

To learn more about key features, check out our complete guide to inbound SIP Trunking.

SIP Trunk Encryption

As SIP Trunking increases in popularity, there have been some questions raised about security. More specifically, SIP Trunks are a bit more vulnerable when it comes to call spoofing, call interception , and malware to name a few. That’s where SIP Trunk encryption comes into play.

SIP Trunk encryption helps secure two layers of your call, both data and audio. Encryption and security is definitely something you should look for in a SIP Trunking provider.

To learn more about securing your calls, check out our SIP Trunk encryption guide.

Learn more about SIP Trunking features and what you can build.