Aastra openphone 28, User Manual

Page: 32 / 104

Making Calls
30
Muting
During a call you can switch your handset's microphone off with Mute . The person at
the other end of the line can no longer hear you. Unmute switches it back on.
Visual Call Indicator
The receiver symbol ¢ in the display flashes and the display illumination is switched
on to indicate an incoming call.
Time / Alarm
In the idle state the display shows the current system time. The system time is auto-
matically updated after an external conversation. After the first commissioning or
after a battery change it might take a moment for the current time to be transferred
from the OpenCom 100 / Aastra 800.
The handset provides you with a programmable alarm function. See page 78 for more
details.
Internal and External Call Numbers
The internal and external call numbers at which you can be reached are assigned
when your OpenCom 100 / Aastra 800 communications system is set up.
Multiple Trunk Keys
There may be multiple configured trunk keys (max. of three with the OpenCom 100 /
Aastra 800 communications system). Each of these keys has its own internal call
number which – dependent of the system configuration – can also be assigned to its
own external call number. Ask your system administrator regarding the configuration
valid for you.
If there are multiple trunk keys configured on your telephone, you can specifically dial
a call number using one of these keys (when dialling directly and for pre-dialling,
please refer to the chapter Making External/Internal Calls starting on page 39). The
first trunk key is assigned as the preference key if you do not select one in particular.
For calls you make from the redial list or from the caller list, the respective trunk key is
automatically seized from which the original call was made.