Can I reduce the latency in my VoIP phone line?

What to do if you have latency issues

By Neil Zawacki
Updated: February 03, 2011

VoIP has been known to suffer from occasional latency issues. Phone calls may be choppy, break up on you, or have echoes from time to time. There are several potential ways to reduce the frequency of these problems.

Sufficient Bandwidth

The first is to make sure that you have sufficient bandwidth available. It is generally suggested to have a minimum of 90 kbps, so you may need to switch to a better internet connection if you’re not allocated that much. It’s also a good idea for your employees to close any applications and videos that might be open and taking up bandwidth when they make a phone call.

Quality of Service

You can also purchase a router that is Quality of Service-enabled. This will allow you to shape the internet traffic on your system and prioritize internet applications as needed when the bandwidth is in use. You’ll want to set the UPD traffic to the ports that range from 10,000 to 20,000.

Old Phone Adapters

Old phone adapters can sometimes cause latency problems, so you should consider upgrading to a new one. They will generally cost you between $50 to $80, and tend to come with advanced features you may find useful.

Distance from Service Provider

Your VoIP phone line may suffer from occasional latency issues if the service provider is located too far away from you. Determine their physical location and consider switching to a closer service provider if one is available.

Firewalls

Firewalls are another possible issue, since they can slow down and stop VoIP signals that are attempting to pass through the system. You’ll want to update the settings to allow VoIP access if you haven’t done so already.

Analog Adapter to Hub

You may also be experiencing latency problems if the computer system running the analog terminal adapter is connected to a hub, since they only have 10 Mb shared medium. This can be remedied by connecting to a LAN switch port on your network router instead.

Codecs

The U-law codec can occasionally help with VoIP latency issues. This is a specialized companding algorithm that reduces the overall quantization error in digital systems. You can download the U-law codec from numerous internet sites at no charge.

Headsets

VoIP sound issues may also occur if you are using a standard headset connected to the computer. Consider purchasing a USB headset, USB phone, or noise canceling microphone as a potential method to improve the quality of your phone calls.

Reset Router

Sometimes, all you need to do is switch your router off and on. You’ll want to unplug the router for fifteen seconds before powering it back on and wait another couple of minutes for the connections to cycle back around, but this may be enough to get rid of the latency issues you are experiencing.

Overall, you want your latency to be somewhere under 150m. If you can get it that low through one or more of these methods, the choppiness and echoes should disappear and the experience much improved.
 

Featured Research
  • The Business Case for Updating an Aging Phone System

    You may think your business phone system is functional, but is it fully modern? In recent years, telecommunications technology has made major strides. A system that was perfectly serviceable ten years ago—or even five years ago—is now very out-of-date. more

  • [Infographic] 15 Questions to Ask When Selecting a VoIP Provider

    Deciding which phone system is right for your business can be difficult. With our VoIP technology blueprint, discover the top 15 questions you should ask VoIP vendors before you make a buying decision. more

  • 2017 Business VoIP Buyer's Guide

    In 2017, more business will transition to a VoIP phone system. If you are among them—or if you’ll be upgrading an existing VoIP system—you need to learn about the latest technologies and market trends. more

  • 2017 Business VoIP Trends

    VoIP and UC (Unified Communications) technology is advancing all of the time. In order to reap the many business benefits of VoIP, you need to learn about industry trends, including text messaging, WebRTC, Unified Communications as a Service, and more. more

  • The New 2016 IP Phone System Comparison Guide

    Choosing VoIP over traditional solutions makes sense for your business and your budget. But choosing the best VoIP solution isn't always easy. Our guide is an essential road map in your search for the best VoIP solution for your business. more