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 .¡ê¡§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 .
