The members of the groups are predefined and a group may consist of tens or even hundreds of members. In addition to individual calls, TETRA also supports group calls. In addition, there is no need to answer the call – the calling party can start talking right away.Īnother differentiating feature between TETRA and cellular services is group communication. In TETRA, a call is initiated with a push to talk button and connection is established in less than half a second. Instant call connection and push to talk operation to set up a call is probably one of the most important features in TETRA.
