13-20 ETSI PRI
297-2521-106 Standard 23.01 March 2001
a No Answer Timer is received from the DAP/NCS in the Suppcode
Response, the No Answer Timer will determine the length of time the
originating switch allows the call to wait for an answer before attempting
overflow.
The No Answer Timer is started under the following conditions:
• The originating switch receives an Address Complete Message (ACM)
from a termination ISUP trunk.
• The originating switch receives an Alerting message from an ISDN PRI
terminating trunk group.
• Outpulsing is completed on a PTS trunk.
When the No Answer Timer expires before an Answer Message (ANM) or
Release message is received from an ISUP termination, a Connect message
or an Answer Supervision on an inband termination, the originating switch
shall requery the DAP with the Enhanced Overflow Treatment Request.
Registered access calls
With registered access, a call originating over an ETSI PRI trunk comes into
the DMS-250 switch. The switch sends a request to the NCS/DAP for
additional routing information or routes the call to an operator. This decision
is based on the Nature of Address (NOA) parameter of the calling party
number.
Registered access calls meet the following conditions:
• The call originates over an ETSI PRI trunk.
• A calling party number is present in the setup message.
• SACFEAT=FLEXFREE in table STDPRTCT.
• REGACC=Y in table FLEXSAC.
Global flexible SAC
Global flexible service access code services are available on all MWC
agencies. FlexSAC services include:
• Free Phone (FLEXFREE)—similar to 800 SAC (called party is billed),
except that FLEXFREE calls route through table FLEXSAC; typically
used for non-domestic services
• Flexible Premium (FLEXPREM)—similar to 900 SAC (calling party is
billed), except that FLEXPREM calls route through table FLEXSAC;
uses ANI screening; typically used for non-domestic services
FLEXFREE/FLEXPREM and enhanced service access code services are
available on ETSI PRI originations. These services are controlled by table
FLEXSAC. The SAC attribute field nature of call (NOC) distinguishes
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