General Features
Features Guide
147
Integrated Services Digital Network (ISDN) Call Hold
Description
You have to let the central office hold a call from an ISDN line as the first step of the ISDN
Conference feature or the ISDN Call Transfer feature. ISDN Call Hold enables you to hold a
call, and to make a call to other external party using only one channel of ISDN (BRI) line.
Notice:
•
This feature complies with the following ETS (European Telecommunication Standard)
specifications: ETS 300 141 Call Hold (HOLD) supplementary service
Conditions
•
The availability of this feature is depending on the contract with your telephone company.
•
If this feature is disabled in programme [460] ISDN Call Hold, you cannot perform ISDN
Conference and ISDN Call Transfer. (Default: disable)
•
The Toll Restriction feature is applied when making a call after activating ISDN Call Hold.
•
Automatic Route Selection (ARS) cannot be applied to the call dialled after activating
ISDN Call Hold.
•
It is impossible to seize any other CO line during ISDN Call Hold.
•
The number dialled after activating ISDN Call Hold will not be recorded to Station Message
Detailed Recording (SMDR). The charge fee will be counted inclusively as the original call
you made or you receive.
Programming Guide References
•
[460] ISDN Call Hold
Features Guide References
•
Integrated Services Digital Network (ISDN) Conference
•
Integrated Services Digital Network (ISDN) Call Transfer
User Manual References
•
2.5.1 Transferring a Call from ISDN Line to ISDN Line (ISDN Call Transfer)
•
2.5.2 Multi-party Conversation through ISDN Line (ISDN Conference)
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