Nortel Networks 6140 - Manual (Page 45)

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Advanced features
3. Press Push-to-talk and then speak.
To end a PTT call Press End to exit the PTT call.
To change PTT volume Use the Up and Down volume buttons
located on the side of the handset.
To answer a call during a PTT
transmission Press Start . The PTT transmission is
preempted by the telephone call.
To start a telephone call during a
PTT transmission 1. Press Start .
2. Enter the number that you wish to call.
The PTT transmission is preempted
during the telephone call.
To turn off PTT Change to a different profile. Silent and
Vibrate disable PTT by default, or
unsubscribe from all PTT channels.