AT&T CL82229 - End or Leave a PTT Call

Multiple handset use
51
Push-to-talk (PTT)
End or leave a PTT call
For one-to-one PTT calls, both initiating and destination devices
can end the PTT call. For PTT calls to multiple devices, the initiating
device can end the PTT call. If any one of the destination devices
leaves the PTT call, the call continues until all participants or the
initiator hangs up.
Press on the handset. The screen shows
Push to talk Ended.
-OR-
Place the handset in the telephone base or charger, then the
handset returns to idle mode.
Note: After PTT is released, the PTT call remains open for a short time. If no one presses PTT
within ten seconds, the PTT call ends automatically.