Mitel SX-200 Documentation page 334

TRUNK-TO-TRUNK CONNECTIONS (EXTENSIONS)
Description
This feature allows an extension user who has an established trunk
call, to hold the call and dial a second trunk. The user may then
converse privately with the third party, transfer between parties or
form a 3-party conference. This feature may be inhibited on an exten-
sion or on a system basis.
Conditions
At least one extension in the conference must remain in the
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connection.
Programming
Select System Options 181 (Can Flash if Talking to an Incoming
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Trunk) and 182 (Can Flash if Talking to an Outgoing Trunk).
COS of extension must include the required Trunk Group Option
Numbers (65 through 76).
Operation
Establish a 2-party trunk call.
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Flash the switchhook - the first party is put on hold; dial tone is
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returned.
Dial the required trunk group access code and directory number
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Flash the switchhook to connect the held trunk to the existing
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call and form a 3-party conference (if COS Option 49 is as-
signed) or to alternatively talk to each party (if COS Option
Number 48 is assigned).
SECTION MITL91 OS/91 10-096-l OS-NA
Page 279