Jitter is inevitable in all digital transmissions. Well designed transmission equipment can tolerate some jitter. Excessive jitter overwhelms most routers. Both video and audio streams are affected by jitter. Jitter manifests itself via video artifacts and audio jitter causes audio artifacts.
MPEG transport streams have become the de facto video media transport via IP. PCR timing compliant transport streams are essential for streaming transport streams to sensitive devices such as modulators, muxers, decoders, and encapsulators. However, many IP transport streams are asynchronous, which makes them prone to jitter when they are sent to PCR time sensitive devices. The Jitter Box IP/IP corrects PCR in non PCR IP stream formats like HLS or RTMP.
Audio packets utilize less bandwidth but are equally jitter prone. Audio jitter plagues VoIP platforms and results in audio breakup. Appliances like the Jitter Box IP/IP or DOZER™ are needed to fix audio that travels long hops.
This product "came to be" since DVEO equipment has had to interoperate with Harmonic®, Ericsson®, Cisco®, and Arris™ video equipment. We had to develop world class techniques to survive.