Mitel SX-200 Documentation page 248

MULTIPLE TRUNK GROUPS WITH OVERFLOW
Description
The system permits up to 12 independent trunk groups to be defined.
Each trunk group may be specified to overflow to another trunk group
when all trunks in the called group are busy. Extensions may be
prevented from using the overflow group on an individual extension
basis. See COS Option Number 52 (Do Not Overflow), Trunk Groups.
Conditions
A trunk may be a member of only one trunk group.
l
All trunks within a trunk group must be of the same type.
l
If an overflow group is specified, the trunks in the overflow
l
group should be of the same type as the originating group.
Programming
Program the overflow option of the trunk group as the number of
l
the group to which extensions are to overflow.
Assign the originating trunk group option (65-76) to the exten-
l
sion's COS. It is not necessary to put the overflow trunk group
into the COS.
Assign Option Number 52 (Do Not Overflow), if required, to the
l
COS of the extension.
Operation
None
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