Siemens optiPoint 400 - Manual (Page 79)

Using Other Functions
79
Step by Step
o
Wait for a dial tone and then enter the code, such as
* 97 for Do not disturb on. Make other inputs as neces-
sary; (refer to the operating instructions for pulse and
DTMF telephones).
or
o
Dial the external number.
You can only execute one function at a time, or
set up only one outgoing connection.
The connection is immediately released after
successful activation of a function.
In the case of an external-external call, the con-
nection is released as soon as either of the par-
ties ends the call.