Basic functions:
Busy transfer
Off shift
Three party call
Direct power failure
blackouts
Request for transfer
No answer back bell
Elastic coding
Password programming
Substitute, substitute
Digital audio recording
Full elastic coding
On call limit
Please give me your extension number
There are multiple outs
A flexible relay group
The timing is adjustable
The main machine is strongly inserted and monitored
There are flexible exhalation restrictions
Strong anti-thunder and anti-jamming performance
Artificial/computer watch
There is an arbitrary setting of outside duty
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