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Special parallel call (ONS) functions

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 waiting Æ page 34

• Call forwarding Æ page 55

• Do not disturb Æ page 56

• Mailbox (MWI) Æ page 12

• Callback Æ page 26

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) B C

ONS group

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Siemens OpenStage 10 T Betriebsanleitung Seite 64