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If the requested trunk pool is dial accessible, an outgoing trunk is selected
and the call proceeds normally.
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If the requested trunk pool is not dial accessible, reorder tone is returned to
the calling party.
Any attempt to dial an outgoing trunk pool by non-tandem tie trunks (that is, tie
trunks whose trunk number does not begin with 9) results in reorder tone being
returned to the calling party.
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Station Message Detail Recording (SMDR): After accessing an outgoing
facility, the tandem trunk’s Facility Access Code (FAC) will be recorded in the STN
field on the call’s SMDR record. If the tandem trunk has no FAC, then the 4-digit
trunk number (9
XXX) will be recorded in the STN field. All other SMDR fields are
unaffected.
Administration Requirements
Except for the need to specify the trunk number as described above, administration of
tandem trunks is the same as for any other tie trunk.
Hardware Requirements
Only dial-in tie trunks (types 1003-1008) may be used for tandem trucking.
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