Patent ID: 8050700

Claim:
A communication network, comprising: an Open Mobile Alliance (OMA) Push-to-Talk over cellular (PoC) network having a first Push-to-Talk (PTT) server adapted to serve a calling party; a Project 25 (P25) network having a second PTT server adapted to serve a called party; the first PTT server adapted to receive a request for a PTT call from the calling party to the called party, to generate a call initiation message for the PTT call that includes an offer for control over the PTT call to the second PTT server, and to transmit the call initiation message to the second PTT server; and the second PTT server adapted to receive the call initiation message for the PTT call, to process the call initiation message to identify the offer for control over the PTT call, to determine whether the calling party or the called party has the floor for initial transmission for the PTT call responsive to identifying the offer, to generate a response message that includes an indication as to which one of the calling party or the called party has the floor for initial transmission, and to transmit the response message to the first PTT server.