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5-6 ELECTRONIC TANDEM NETWORK (ETN) THROUGH THE ETN AND PNA PACKAGES
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TANDEM
PBX
(555)
TO C.0.
555-1234
ATTENDANT
555-0111
444-1234
TANDEM
PBX
(444)
TO C.0.
ATTENDANT
444-0111
TANDEM
PBX
TO C.0.
(666)
ATTENDANT
666-0111
666-1234
TO C.0.
ATTENDANT
689-0111
MAIN
PBX
(689)
689-1234
TO C.0.
TRIB.
(654)
654-1234
MAIN
PBX
677-1234
(677)
SAT.
(677)
677-3456
ATTENDANT
677-0111
TO C.0.
ATTENDANT
654-0111
Figure 5-3. Private Network Uniform Numbering Plan