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Special functions for One Number Service
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Special functions for One Number 
Service
If your telephone is integrated in an ONS group (ONS = 
"One Number Service"), you may be reached on all other 
telephones in this group, just as on your own tele-
phone. For setting up an ONS group, contact your ad-
ministrator.
An ONS group can consist of a maximum of 
3 telephones (phone numbers).
One member of the group may be an external tele-
phone (e.g. a mobile telephone). One telephone in the 
group is the "master" (A); the master's phone number is 
also received by the other parties (B, C) in the ONS 
group.
If A, B or C is called, all telephones in the ONS group 
ring. If A, B or C is busy, all telephones in the ONS group 
are busy (busy tone for a caller from outside the ONS 
group). Each telephone within the ONS group may be 
reached at its original phone number.
The following features have further effects for internal 
party telephones within an ONS-group:
Call waiting 
Call Forwarding 
Do not disturb 
Line mailbox (MWI) 
Callback 
If your ONS group contains a mobile tele-
phone, make sure that it is always available 
(switched on). Otherwise the mobile mailbox 
may answer the call prematurely, which can 
lead to problems when signaling the call on 
the other ONS group members.
A (Master)
B
C
ONS-Group