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Special parallel call (ONS) functions
132
Special parallel call (ONS)
functions
If your phone is part of an ONS group (ONS = "One
Number Service"), you can be reached on all other
phones in this group as well as on your own phone. To
set up an ONS group, contact your service personnel.
An ONS group may consist of up to three phones
(phone numbers).
Up to one group member can be an external phone
(such as a mobile phone). One phone in the group is the
"master" (A) - the other ONS group members (B, C) re-
ceive A’s number.
If A, B or C receive a call, all phones in the ONS group
ring. If A, B or C is busy, all phones in the ONS group
are busy (callers outside the ONS group receive a busy
signal). Within the ONS group, phones can be reached
on their original phone numbers.
The following functions also have an additional impact
on internal member phones in an ONS group:
• Call waitingÆ page 62
• Call forwardingÆ page 48
• Do not disturbÆ page 106
• Mailbox (MWI) Æ page 35
• Callback Æ page 53
• Call lists Æ page 58
If your ONS group contains a mobile phone, you
must ensure that it is always available (switched
on). Otherwise the mobile mailbox may pick up
a call too early, leading to call signaling problems
on the other ONS group member phones.
A (master) BC
ONS group
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