Atos Unify OpenScape CP110, User Manual, Page: 99 / 116

Special parallel call (ONS) functions 99
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 on your own
phone. Consult your administrator about setting up an ONS group.
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 ) receive A's number.
If A , B or C receives 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 waiting

Page 57
• Call forwarding

Page 46
• Do not disturb

Page 101
• Mailbox (MWI)

Page 18
• Callback

Page 51
• Call lists

Page 36
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 pro-
blems on the other ONS group member phones.
A (Master) B C
ONS group