Starting with firmware 500.1, the push-to-talk functionality is available on our handsets M65, M70, M80, M85 and M90.  It allows the handset to be used like a handheld transceiver (walkie-talkie) between handsets registered at the same base station or in the same multicell system. The function must be enabled on each handset, and the handset must be idle to transmit or received push-to-talk calls.  Only one person can speak at a time.

In the default setting, the feature is off.  It must be enabled for each handset individually, either on each individual handset or on the base station web interface.

Enabling the function in the handset menu

1. Press the menu key.
2. In the main menu, select Settings.
3. In the settings menu, select "Push To Talk" to enable the function for this handset.
4. Select "On". 

Enabling the function on the base station's web interface (from firmware 530B2)

1. In the menu on the left side, click Extensions.
2. In the table on the Extensions page, click the IPEI of the handset whose push-to-talk function you want to enable. 
3. On the Handset page, select Enabled from the drop-down list of Push-to-Talk.
4. Click Save.
5. Repeat step 2 and 3 for each handset you want to be able to use the function.

Using the function

To initiate a call to all handsets in the system that have enabled the push-to-talk function, the handset must be idle.  Only idle handsets will receive the call on speakerphone, and only one person at a time will be able to talk.

1. To initiate a call to all handsets in the system that have enabled the push-to-talk function, press and hold the mute button. The handset will open a direct communication channel to the other handsets. Note:  push-to-talk calls will only be received by idle handsets.  
2. Release the mute button to end the call. 
3. Now another person can press and hold the mute button on their handset to respond.  Note:  Only one person can speak at a time.