Starting with firmware 530.2, the push-to-talk functionality is available on our A190 headset.
This feature enables the handset to function like a Walkie Talkie by pressing and holding the hook button on the headset.
To enabled it, you need to use the base station's web interface with these steps
Once it has been enabled
The calling headset needs to be in idle state, the call will be automatically answered on speakerphone on all the handsets with the push-to-talk enabled, and it is only possible for one person at a time to talk using the push-to-talk functionality.
When the push-to-talk feature is enabled on one handset on a system of base stations, only six calls can be ongoing at the same time from any base station which has the handset connected.
Do not re-assign the long press for the Hook button on the A190 with any other functionality, or you will loose the ability to use the PTT.
To go back to being able to use the PTT when long pressing the Hook button, you can upload an MMI file where the "State: Idle -> Key: Hook -> KeyPress: Long" isn't defined.
For more information about MMI file, please take a look here How to assign functions to the A190 buttons