OmniLink is a type of Trunked radio system with multiple sites, providing a broad range of robust system features and utilizing a distributed call processing architecture linking up to four multi-site systems together into one seamless network, supporting up to 192 sites. Typical users of OmniLink systems include organizations who have vast geographic requirements.

Each Zone in an OmniLink network is considered its own network, with its own unique system ID, and is controlled by its own Zone Controller. Properly equipped radios can be permitted or restricted to roam from one Zone to another. The OmniLink infrastructure permits each Zone Controller to communicate and coordinate these roaming actions. (This is similar to cellular networks and roaming onto another carrier's network)