How to reduce Jitter?

While Jitter can be minimized and reduced, through the use of jitter buffers, this is not a ‘magic solution’. A buffer is a caching system for receiving data packets. A voice call is broken into packets of data and sent over a network. Packets can be stored by a buffer on the other end. Whereas latency measures delays to VoIP calls, jitter measures latency's variance within a network. However, letting too large a buffer directly increases the latency of actions on the sender's side being received by a user, so you need to be careful in the size of the buffer. 

Depending on the size of the jitter buffer, out of sequence packets can be rearranged before being delivered. However, this does introduce some delay in addition to the original latency on the network.

Increasing the buffer size directly increases the delay of actions to the receiving end. Likewise having a buffer be too small can lead to call degradation as an excessive number of packets may be discarded. So you need to be cautious in the size of the buffer. Generally, they are only effective for delay variations of less than 100 ms, and even then, deterioration in quality may be easily noticeable to users.

Another issue to be cautious of when using Jitter buffers is ‘buffer bloat’. Bufferbloat occurs when your router is unable to transmit all the packets required and builds up too large a queue (rather than dropping packets when the queue length starts making latency noticeable). This queuing causes large latency and bursts of jitter. The real-time nature of voice means that this is not helpful. Therefore organizations should try to identify the sources of jitter on their networks instead of relying on jitter buffers.

Network monitoring does measure a nice selection of audio quality factors including Jitter, but provides a view to the private network, while businesses use inbound services to engage with customers from outside of their private network. Number Testing provides a wider variety and end-to-end perspective. Through the use of proactive monitoring and number testing, Spearline is able to alert issues that may have underlying jitter causes, rather than be overly reliant on jitter Buffers.