Mitel SX-200 Practices page 269

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Features
The other aspects of interconnection are done only if the tenant connection
check passes.
The Device Interconnection Table is a table that the installer can program to
limit interconnection from one device type with another and with itself. This
restriction can be applied in either direction if desired. The Device
Interconnection Table alone applies when the two devices in question are
not both trunks. When two trunks are to be connected together, the Device
Interconnection Table restrictions apply. In this case, COS Options may
apply additional restrictions.
The COS Options apply additional checks when trunks are to be connected
together. The COS Options do not override the Device Interconnection Table
but add finer control to the table. The Options apply when a third party (a
console, extension or trunk) attempts to leave two or more trunks connected
together by a supervised transfer. The COS of the third party is used for the
checks,
The following rules apply for the COS Option checks:
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CO to CO trunk checks COS Option
313
(CO Trunk To CO Trunk Con-
nect)
CO to Tie checks COS Option
314
(CO Trunk To Tie Trunk Connect)
Tie to CO checks Cos Option 314 (CO Trunk To Tie Trunk Connect)
and 319 (Extension non-CO Trunk To Trunk Connect)
CO to DID checks COS Options 315 (CO Trunk To DID Trunk Connect)
DID to CO checks COS Options 315 (CO Trunk To DID Trunk Connect)
and 319 (Extension Non-CO Trunk To Trunk Connect)
Tie to Tie checks COS Option 316 (Tie Trunk To Tie Trunk Connect)
and 319 (Extension Non-CO Trunk To Trunk Connect)
DID to Tie, Tie to DID checks COS Option 317 (Tie Trunk To DID Trunk
Connect) and 319 (Extension Non-CO Trunk To Trunk Connect)
DID to DID checks COS Option 318 (DID Trunk To DID Trunk Connect)
For DISA trunks, the underlying circuit descriptor trunk types are
checked against the device interconnection COS Options,
Incoming Tie trunks have no COS Option checking.
Conditions
The following conditions apply to this feature:
9109-096-l 05-NA
When a device hangs up from a three party call, the Device Intercon-
nection feature applies between the remaining parties. The third party
that is used in the COS option checks is the party that hung up. If the
two remaining parties cannot connect, then the call is cleared down.
When a device hangs up from a four or five party conference call, if
there are only trunks left in the call, the Device Interconnection feature
is applied between each trunk in the call (both ways). The third party
Issue
1
Revision
0 105 2-197