If EXO has the push-to-talk (PTT) feature enabled and is in cellular coverage, it can send and receive voice messages with other EXO devices and G7c devices using the same channel, similar to a walkie-talkie. EXO can still receive and send PTT transmissions when it is locked by a maintenance code. See the Maintenance Code section for more information on the maintenance code.

PTT only works when EXO is connected to Blackline Live through a cellular network. PTT does not work during a low-urgency or high-urgency notification state unless the notification has been muted. PTT only allows one transmission on a channel at a time.