... -reverse,12 or 16 KHz pulse signal 3)support GPRS 4 line Wireless Terminal Unique Functions1,GSM cellular network outgoing.2,GSM cellular network ... incoming.3,DTMF Caller ID.4,Support secondary dial.5,Lock card, lock terminal.6,Send polarity reversal signal for ... ,DTMF Receive sensitivity: 99.99%9,Insertion loss: ≤0.5dB 4 line Wireless Terminal/Fixed wireless terminal