When the outside caller hangs up the call, the receiver extension is disconnected in too long time.

'DISA' / 'Settings' / 'Timers' / 'DISA Ring Time after Intercept(s)' - change it to '10'.

How to let an outside caller directly call an extension instead of Operator (101)?

1. Record an OGM message on 101.
2. 'DISA' / 'Settings' / 'Security' / 'DISA Security Mode' - change it to 'None'.
3. Done.

When there is an incoming call, the ringing time is too short

'DISA' / 'Settings' / 'DISA Ring Time before Intercept(s)' - change it to '120'.

How to cancel incoming call auto transfer to operator, when no answer?

DISA / Settings / 'DISA Intercept Mode' - change 'Intercept' into 'Disconnect'.