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3 Common Problems with SIP Trunking (And How to Solve Them)

A SIP trunk is essential for businesses that are looking for a more efficient and modern phone system. But despite its upgraded capabilities, users can sometimes experience problems with SIP trunking. To help users alleviate these issues, we’ll discuss common problems you may experience and ways that you can troubleshoot them.

Issues porting your numbers

One of the best things about SIP trunking is that you can keep your existing communications infrastructure - and that includes your numbers. If all goes well, outgoing carriers and your provider can work together to move your numbers in two weeks or less. But in some cases, you may experience a longer wait time for your numbers to be completely ported over.

You can usually address this issue by working directly with your carrier and your SIP trunk provider to move the process along as quickly as possible.

Setting your system up for simultaneous calls

When you’re moving to a SIP trunk, it’s important to evaluate the number of call paths, or SIP trunk channels, that your system will need. If you don’t, you may experience issues when you’re trying to make simultaneous calls on your system.

Although this is one of the most common problems with SIP trunking, it's also easy to fix. You can address this issue by ordering the number of call paths you’ll need to handle the total number of concurrent calls that your business handles during your busiest hours.

Choppy or lagged calls

If you’re experiencing choppy or lagged calls with your SIP trunking service, you may not have an adequate amount of bandwidth available on your Internet service. Because VoIP runs entirely over the Internet, it’s essential that you work with your Internet provider and your SIP trunk provider to ensure that your system can handle each of your incoming and outgoing calls.

If you're curious about how much bandwidth is needed to support high quality calls, you can use this simple equation:

Number of Concurrent Calls x 85 kbps = Required Bandwidth

Keep in mind that some codecs might require more than 85 kbps per call. However, most SIP providers use the G.711 and G.729 codecs, which usually require anywhere from 85 - 100 kbps to handle a single call.

If you have more than enough bandwidth and are still experiencing choppy or lagged calls, it may be time to take a look at your Quality of Service (QoS) settings. QoS allows you to prioritize certain types of traffic, such as voice calls, on your data network. Since other forms of data are not time sensitive, you can adjust your QoS settings to always put voice traffic first.

Solving Problems with SIP Trunking

As you can see, problems with SIP trunking are easily addressed by setting up your system correctly and working closely with your provider. If you experience any of the problems above, use our recommended tips or contact your provider for more assistance.

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