CMP Using CallExtend on a Mitel SX Service Manual

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,

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:

program the following command settings as shown:

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
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.

to the CallExtend, and not to the console, additional

On an SX-100 or SX-200, program the following settings as shown:

Disable System Option 189 (flash timing = .7), System Option 190 (flash timing = .9), and
System Option 191 (flash timing = 1.1).

Set System Options 180, 181, 182, 183, & 188 as desired to allow hook-flashes to be
performed on the appropriate types of calls.

Set up a hunt group with both CallExtend extensions in it, and assign the desired trunks to
ring to this hunt group. If used in night mode, assign the hunt group to answer calls for the
respective night number.

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.
For most applications, we suggest enabling
disabling
(Broker’s Call), 49 (Station Conference), 62 (Flash for Attendant), and 99 (Handsfree
Operation).

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 following information.

COS Options 44 (Originate Only), 45 (Receive Only), 46 (Flash Disable), 48

COS Option 98 (Transfer with Privacy) and

If the commands shown for the SX-50 and the SX-100 / SX-200 do not work for your phone
system or are not complete, use the following guidelines to program your system appropriately:

1. The hook-flash in the Mitel must
NOT the default hook-flash setting in the Mitel, so the phone system will have to be
programmed specifically for this setting. In some phone systems, this is done by selecting
this range instead of the default 150 ms - 750 ms range. In other systems, this is done by
specifically turning off all other hook-flash settings (.7, .9, 1.1). Once the Mitel’s hook-flash
has been set, CallExtend should be programmed to use its 500 ms hook-flash setting (this is
the default setting).

2. A number of Class-of-Service (COS) and system options in the Mitel must be programmed
to allow BOTH of the extensions that are connected to CallExtend to answer and transfer
calls. The Mitel must be programmed to allow the extensions to do the following:

be set to the 150 (or 200 ms) - 1500 ms range. This is

 answer extension calls

 answer incoming trunk calls