BASIC CALL HANDLING PROGRAMMING TASKS DX-120 Programming Manual
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Establishing Start and End of SLT Hook Flash
• Single Line Telephones and similar analog devices connected to analog ports of the DX-120 system must use
unsophisticated signaling to administer call-processing operations (like transfer and hold).
This fundamental call
control is handled in the form of specific hook-switch operations.
These are known as hook-switch flash (or just
flash) commands.
• Whenever extension users want to invoke a system feature at a single line telephone, they must operate the
hook-switch in a fashion that is distinguishable from an on-hook (hang up) request. This becomes essential for
proper handling of calls, considering the user may operate the hook-switch quickly to hang up and place a new
call. Yet this fast operation of the hook-switch might be interpreted as a hook-switch flash operation.
• Considering these factors, the DX-120 system allows you to customize the hook-switch command monitoring.
You can direct the system to ignore hook-switch operations that are considered too short to be valid, and to limit
the time allotted.
• The following conditions apply to SLT hookswitch flash:
- If the analog device/SLT does not have a hook-flash operation button, extension users must operate the
hook-switch within the time you specify in the “Start” and “End” settings. If they do not, the system does not
process the user’s action as a valid hook-flash operation.
- The system ignores hook-switch operations that are shorter than the “Start” time.
- The system considers hook-switch operations that are longer than the “End” time as hang ups.
ESTABLISHING START AND END OF SLT HOOK FLASH VIA PC-DBA
From the PC-DBA main screen:
Establishing SLT Hook Flash via PC-DBA (continued on next page)
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