1.Caller ID for C.O Lines and extension,telephone number is not lost when transferring .             

2.Outline calling on duty manual/automatic mode,Ringtone mode.          

3.Three-section of digital recording can be 20 seconds .(optional 30s-90s).           

4.When calling no one answer or the line is busy can be transferred .       

5.Calling level for extension and the talking time is limited .           

6.The extension number ranges can be mixed .          

7.Outline or inline calls can be answered the Phone for Others , transfer, retention, monitor .        

8.Checking telephone caller id number and voice checking .            

9.Automatic IP dial-up .       

10.Call center function, extension hotline number, Ringtone function.             

11.Automatic on duty and abbreviated dialling .        

12.Remote maintenance, hardware self-tested .