
Using CallExtend on a Mitel SX phone system
For CallExtend to function on a Mitel phone system, the phone system must be programmed
appropriately. Although we do not resell or support Mitel phone equipment, we have received
information about these phone systems from a number of dealers in the field. We have put this
information together in the rest of this document. We cannot guarantee that this list is complete
or accurate, but hopefully it will help you program your phone system appropriately.
On an SX-50,
program the following command settings as shown:
Command 100, register 6 - c = 1 (150-1500 ms) – This controls the system hook-flash timer.
Command 121-129, register 2 - b = 1 (flash for consultation hold) – This allows CallExtend to
perform a hook-flash to place the caller on hold while it dials an extension.
Command 121-129, register 3 – l = 0 (no room status on COS for CallExtend extensions) –
This ensures the phone system realizes the CallExtend extensions are not room phones and
thus does not restrict activities from these extensions.
The following commands place the CallExtend extensions into a circular hunt group, so
incoming calls can ring to whichever extension is available:
Command 361, register 1 - b = 0 (circular hunt)
Command 361, register 2 = first extension to be used with CallExtend
Command 361, register 3 = second extension to be used with CallExtend
Command 501-580, register 2 - c = 1 (disconnect supervision guaranteed)
Create a Class-of-Service (COS) for the CallExtend extensions (don’t use the rooms’ COS).
Set up this COS to allow calls to be answered, a hook-flash performed, and calls transferred.
If incoming calls are to ring only
to the CallExtend, and not to the console, additional
programming may need to be completed in the phone system.
If CallExtend is to be used in Supervised Mode, set the Hold Recall Timer to a longer value
than the number of rings CallExtend is set to supervise. If CallExtend is to be used in
Unsupervised Mode, set the Transfer Recall Timer to a high value, or disable it, to prevent
unanswered calls from ringing back to CallExtend and getting the main greeting again. (If the
Transfer Recall Timer cannot be disabled, it is usually best to have the Mitel forward
busy/unanswered call transfers to the console after the desired period of time.)
For additional settings, see the information at the end of this document.
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