Siemens optiPoint 400 - Manual (Page 15)

Making Calls – Basic Functions
15
Step by Step
The called party does not answer or is busy:
Press the key. The LED goes out.
Ending the call
t
Replace the handset.
or
Press the key.
Speaker
Your system may also be programmed so that
you have to press the Internal key before you dial
an internal number.
To call an external party, you have to enter an ex-
ternal code before dialing the party’s telephone
number (Prime Line is not active; contact your
service personnel).
Release