Inbound SIP Trunk Explained

SIP stands for session initiation protocol and can be the centrepiece of your VoIP (Voice over Internet Protocol) telephone system. It can make your communication systems more efficient and save you money.

What Is an Inbound SIP Trunk?

An inbound SIP trunk lets you receive calls from any phone to your PBX system or call center using an internet connection. That means you can operate your business phone system without having to install telephone lines, sign long-term contracts with telecom providers, or waste money on lines you rarely need.

No matter how you handle your phone calls, either in a traditional business phone system or VoIP solution, you need to connect to the Public Switched Telephone Network (PSTN) that powers existing phone networks around the world.

If you think of the PSTN as a modern replacement for telephone operators sitting in front of cables and patching one into another, you have a good idea of how it works. Instead of connecting cables, the PSTN uses circuit switching through various networks to connect calls.


How Does an Inbound SIP Trunk Work?

While you still need access to the PSTN, a SIP trunk replaces the need for traditional analog or T1-based lines to connect. Using the internet with VoIP, the connection from your phone is routed through SIP trunks into the PSTN directly. This allows businesses to share trunk lines, reducing the number needed and the cost, as well as avoid long-distance or overseas call charges since every call is essentially a local call.

If you have used VoIP in the early days, you might have the impression that call quality can be poor, connections can be spotty, or you had to wait to make calls because the lines were tied up. Those days are gone.

A SIP trunk routes traffic through available networks to avoid jammed lines and can re-route as necessary. In this way, they are often more reliable than traditional phone service. Because the majority of the call routing happens within the internet, there is no added cost. Only the final connection is handled through the PSTN just like any other phone call.

Advantages of Using an Inbound SIP Trunk Connection

By converging your local and long-distance calling onto a single circuit, you can save money on incoming toll-free calls and outgoing long-distance or overseas calls. In addition, there are significant advantages to using an inbound SIP trunk connection to receive calls or an outbound SIP trunk connection to make calls, such as:

  • More reliable, with less downtime, due to the ability to automatically reroute around problem points
  • A single point of contact to manage your network connection with a flat monthly bill to control and plan your budget
  • Integration with almost any IP-based PBX systems and existing devices
  • Manage remote locations and devices from one central cloud-based access point
  • No waiting weeks or months when adding lines
  • Scalable as needed with an easy way to add SIP trunks when you need to grow
  • Since it is cloud-based, there is little to no hardware required
  • Faster ROI when replacing legacy telephone systems

How a Cloud-Based SIP Trunking System Can Help My Business?

Using 8x8’s cloud-based solutions can increase your productivity and efficiency by unifying your communications across platforms and devices. Handle voice, video conferencing, team messaging, email, and contact centers through our system and stay connected to your employees and customers. They can communicate on any device from anywhere at any time.

With unified communications, you have one system to manage all modes of communication at home base, remote locations, or for remote workers. It also provides a single data source to analyze while connecting to popular business apps such as Salesforce, Zendesk, or NetSuite.

Plus, you can rest assured that 8x8 takes data security seriously with its security compliance for SOX (Sarbanes-Oxley Act), HIPAA (Health Insurance Portability and Accountability Act of 1996), FISMA (Federal Information Security Management Act), and other industry standards.

Choosing the right technology is crucial to a growing business. Take the uncertainty out of the equation by choosing a SIP trunking technology provider that can scale to meet your business' needs whatever they may be at any given time. Call 1-866-879-8647 or fill out an online form to request a no-obligation quote from an 8x8 product specialist.

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