Fiber optic cables are the future of the Internet. And the future of your telephone.
The “traditional phone line” is slowly being replaced.
Great for Internet use, but problematic for phone use in a disaster.
This change will make more adoption of voice over IP (VoIP) phone systems. With VoIP, you have more economic phone calling, but the regular draw backs of Internet use.
In this article I will discuss acceptable VoIP jitter.
What is Jitter?
Jitter is the irregular distribution of data packets. In a healthy network with low latency and little congestion, data travels at consistent, regular intervals. It is predictable.
Jitter is any variance in this distribution. This variance which causes packet loss, congestion, and a poor user experience.
What is Acceptable VoIP Jitter?
VoIP is connecting phone systems to the Internet. This means that all the networking considerations have to now be applied to phone systems. This means our jitter tolerance level as well.
Acceptable VoIP jitter is no more than 30 ms.
This is a low tolerance. Although you can begin to see a drop in call quality at 30 ms, the detrimental effects are at 100 ms of jitter.
Jitter in a VoIP system can be a quality of service (QoS) issue. This means that the router configuration on your network may not be configured, or it is set up poorly. This would mean that voice data is not receiving the priority. The result is low call quality.
Why VoIP Will Experience Jitter
As VoIP is using the Internet to make phone calls, this means it is susceptible to Internet problems. Jitter being one of these problems.
VoIP jitter occurs, for the most part, on the customer end. One of the main causes is prioritization. Data packets will get placed between voice packets and disrupt the normal transmission flow. This issue will have to be resolved at the router level, which becomes a quality of service (QoS) issue.
The other reasons that VoIP will experience jitter is that it now has to contend with latency, bandwidth, congestion, and packet loss. All issues inherent with border gateway protocol (BGP) and Internet infrastructure.
How to Solve for VoIP Jitter
To solve for the negative impacts of jitter, the use of a jitter buffer can help.
A buffer is a caching system for arriving data packets. A voice call is broken into data packets and sent over a network. A buffer on the other end can store the packets. This ensures that there is a buffer zone for network imperfections.
This does not solve the causes of your network jitter. It provides a “Band-Aid” to ensure call quality is not affected. To solve for jitter, you will need to check router configuration settings. Ensuring that QoS settings are properly configured can begin to reduce jitter issues.
Jitter for VoIP can be a problem by degrading the quality of phone calls. Understanding your jitter tolerance can ensure you design your network for VoIP.
To learn more about how to address jitter, you can download the AWS Network Optimization Whitepaper.