Glossary

MTU stands for "Maximum Transmission Unit". It is the largest size of a packet that can be sent over an IP network without splitting it into multiple packets.

When data is sent over UDP (which is the case when sending voice and video packets using RTP), there is a need to make sure the data being sent doesn't pass the MTU size of the network. this is done by various packetization schemes that are part of the transport layer of multimedia protocols.

In most cases, the MTU size configured for a network is around 1500 bytes. This may vary from network to network due to various reasons, making it essential for video communication products to be able to configure manually the MTU size they are using.