vi(CONTENTS CONTINUED…)DTMF (DUAL TONE MULTI FREQUENCY) CALLS ................. 30MAKING A DTMF CALL (K3 MODELS ONLY) .......................... 30AUTODIAL (K2 AND K3 MODELS ONLY) ............................... 31STUN CODE ......................................................... 31EMERGENCY CALLS ................................................. 32SCRAMBLER (FM)/ ENCRYPTION (APCO) ......................... 33SECURE (ENCRYPTED) TRANSMISSION .................................. 33SELECTING THE SCRAMBLER CODE ..................................... 33SELECTING THE ENCRYPTION KEY ...................................... 34DELETING THE ENCRYPTION KEY (K2 AND K3 MODELS ONLY) ........... 34PASSWORD PROTECTION (K2 AND K3 MODELS ONLY) .................. 34SIGNALING ............................................................ 35QUIET TALK (QT)/ DIGITAL QUIET TALK (DQT) ....................... 35OPTIONAL SIGNALING ................................................. 36VOICE OPERATED TRANSMISSION (VOX) ......................... 37VOX GAIN LEVEL .................................................... 37VOX OPERATION .................................................... 38CLOCK (K2 and K3 Models Only) ................................... 39CLOCK ADJUSTMENT .................................................. 39ADVANCED OPERATIONS ............................................ 40BACKGROUND OPERATIONS ....................................... 49TIME-OUT TIMER (TOT) ............................................. 49BATTERY SAVER ...................................................... 49LOW BATTERY WARNING ............................................. 50COMPANDER ......................................................... 50PTT ID ............................................................. 51BUSY CHANNEL LOCKOUT (BCL) ..................................... 51