Do your VoIP services have a case of the ‘jitters’?

Since the global adoption of VoIP and video as primary communication solutions, Unified Communications (UC) has never had a more valuable asset. The ‘VoIP approach’ provides organizations with feature-filled telephony service at a fraction of the standard company telephony price,  proving highly effective. The lack of dependence on traditional copper lines and a Publicly Switched Telephone Network to make calls allows for more versatility than ever. 

However, because VoIP relies on an internet connection, poor network performance is one of the most common issues affecting it. With network jitter one of its significant culprits, smooth communication becomes problematic and inconvenient. VoIP technology transforms voice fragments into data packets that are digitally transferred over the internet. The lack of packet prioritization is among the most common causes of Jitter on VoIP services. The end-user is very likely to experience Jitter if voice packets are not prioritized.

Jitter refers to the variation in the latency/time delay of packets carrying voice or video data over a communications channel. Jitter happens when the RTP packet stream traverses the network (LAN, WAN, or Internet) because it has to share network capacity with other data.   


Data packets contain the:

  1. Source and destination IP addresses and ports
  2. IP telephony signaling and call status
  3. Sequencing and the number of packets
  4. Optional Quality of Service (QoS) data headers
  5. Protocol information along with its checksums
  6. Hardware address information (e.g., MAC addresses)  


Jitter can cause many participants to leave the phone call and attempt to re-establish a connection or move to another form of communication. We often tend to ‘drop the call’ and quickly try to reconnect straight away. But sometimes this hassle is considered too much for your customers, and they could easily try to connect with your competitors instead.


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There are multiple types of Jitter: 

  • Random Jitter: Also referred to as “Gaussian jitter,” random Jitter is unpredictable electronic timing noise. It is usually resulting from clock timing problems or random electronic timing noise.  
  • Deterministic Jitter: This type of Jitter can be predicted or determined. Reproducible, limited and may be periodic. Deterministic Jitter can either be correlated to the data stream (data-dependent Jitter) or uncorrelated to the data stream (bounded uncorrelated Jitter).  
  • Total Jitter: This is calculated using a bit error ratio (BER), as well as a combination of random and deterministic Jitter. The mathematical formula for calculating total Jitter is Total Jitter = Deterministic jitter+2*BER*Random jitter.  
  • Short-term delay variation: An increase in the delay that persists for some number of packets may be accompanied by an increase in the packet to packet delay variation. This type of Jitter is usually due to congestion and route changes.


All networks experience some amount of latency, especially wide area networks. Ideally, over a normally functioning network, packets travel in equal intervals, with a 10ms delay between packets. With high Jitter, this could increase to 50ms, severely disrupting the intervals and making it difficult for the receiving computer to process the data.
Ideally, Jitter should be below 30ms. Packet loss should be no more than 1%, and network latency shouldn’t exceed 150 ms one-way (300 ms return).  


Whats causing this?

The cause of Jitter can be pinpointed to a number of reasons, some of which are: 

  • Misbehaving hardware
  • Hardware capacity on source/destination
  • Network capacity 
  • Bad routing through network/internet (traffic routed in a suboptimal fashion introducing delays, etc.)
  • Wireless networks
  • Network congestion  


In-Country Number Testing

There is no network free of Jitter. But some networks have it close to zero. By knowing about the Jitter in your network and keeping track of it, you can reduce it. Traditional network monitoring tools only look to the private network, but Spearline’s functionality verifies the call routing to the customer from your network or vice versa.  Network monitoring does measure an excellent selection of audio quality factors, including Jitter. 

Still, it provides a view to the private network, while businesses use inbound services to engage with customers outside of their personal network. Number Testing offers a wider variety and end-to-end perspective. Spearline can alert issues that may have underlying jitter causes rather than be overly reliant on Jitter Buffers through the use of proactive monitoring and number testing. Be sure to read our whitepaper today for a better in-depth understanding of network monitoring and number testing.

Find out more about Spearline

If you are new to Spearline and would like to find out more about how you can benefit from the platform, we would love to speak with you. Please send us a brief message, and we will be in contact with you shortly. Spearline’s platform proactively tests inbound telecommunications services, as well as dial-out.

Connectivity and audio quality are monitored on fixed-line, SIP, or mobile networks, globally. Spearline enables organizations to provide uninterrupted services to customers around the world. For further information, or if you have any further questions please get in touch with us.


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