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2-14
NETWORK CONNECTIONS AND CONFIGURATIONS
Dial Tone
Second dial tone may be provided by a 4ESS. However, it is recommended that the customer-
premises switch provide a second dial tone. With this arrangement, the second dial tone can be
provided through use of the ARS feature on all ISDN-PRI trunks that terminate on a 4ESS.
Touch-Tone Capability
ISDN-PRI does not support either dial pulse addressing or touch-tone signaling, but provides the
equivalent capabilities with ASCII character signaling on the D-channel.
Screening Intra-LATA Calls
A 4ESS can be used to block intra-LATA calls. However, all System 75, System 85, Generic 1, and
Generic 2 special-access applications should use the ARS feature to screen outgoing calls. By using
the ARS feature, only inter-LATA calls are routed to a 4ESS.
NFAS
Nonfacility-associated signaling is supported by a 4ESS. From a Generic 2 perspective, there are no
restrictions with this capability.
Backup D-Channel
The D-channel backup is supported by the 4ESS. From a Generic 2 perspective, there are no
restrictions with this capability.
Codeset
Both 4E11 and 4E12 receive and transmit UUI data in codeset 7.
4ESS receives and transmits UUI data in codeset 6. However, it will still tandem codeset-7
information.
User-to-User Information transfer
To pass user-to-user information (UUI) through the ISDN public network, all 4ESS-to-4ESS links
must be implemented with CCS7. If as many as one link is implemented with CCS6, then UUI will
not be passed.