IP Phone User Manual

1.20 Integrated Services Digital Network (ISDN) Service Features
Feature Guide 193
1.20.1.6 Call Hold (HOLD)—by ISDN
Description
An ISDN call can be put on hold using the ISDN service of the telephone company, instead of
the PBX feature. This can be a part of a Call Transfer (CT)—by ISDN ( 1.20.1.7 Call Transfer
(CT)—by ISDN) and Three-party Conference (3PTY)—by ISDN ( 1.20.1.8 Three-party
Conference (3PTY)—by ISDN). This feature allows an ISDN call to be held, and a call to be
made to another outside party using only one communication channel of ISDN. A PT user can
easily use this feature by pressing the ISDN Hold button.
This feature complies with the following European Telecommunication Standard (ETS)
specifications: ETS 300 141 Call Hold (HOLD) supplementary service.
Conditions
• ISDN Hold Button
A flexible button can be customised as the ISDN Hold button.
• The availability of this feature is dependent on the contract with the telephone company.
• The TRS/Barring feature is applied when making a call after activating this feature. (
1.8.1 Toll Restriction (TRS)/Call Barring (Barring))
• ARS cannot be applied to the call dialled after activating this feature. ( 1.9.1 Automatic
Route Selection (ARS))
• It is impossible to seize any other trunk during this feature.
Feature Guide References
1.19.2 Flexible Buttons