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7-50 Feature interaction
Passing the NCID
During the progress of a call, the NCID is passed as follows:
NCID screening
Table CALLATTR allows control of NCID delivery in the outgoing PRI
SETUP messages.
Enhanced voice system audio response unit
The enhanced voice system (EVS) audio response unit (ARU) is designed
for functions that include menu routing, announcements, and voice mail, and
can record and replay audio messages and detect customer DTMF digits or
voice input. It can also initiate a call transfer (extension) to a new
destination. Switches that have voice and data interfaces to an EVS ARU are
called EVS switches.
Figure 7-14 shows the EVS network configuration, and illustrates that an
EVS call can originate on either an EVS or non-EVS switch. However, only
EVS switches can terminate EVS calls.
297-2521-106 Standard 23.01 March 2001
The incoming PRI SETUP message will not contain an NCID; however,
the DMS-250 switch will generate one. This is an example of an NCID
generating at an intermediary switch.
in the MCI ISUP IMT IAM message to other switches
in the ADF message to the DAP
in the ISUP RLT IAM message to the ISN platform
in the SETUP or IAM for PRI and ISUP RSLR originations to other
switches
from the DAP in an ADF message
from the ISN platform in ISUP RLT FAR or ISUP RLT IAM message
off the network to the PRI, ISUP RSLR (STD, OPTION1, or
OPTION2), or ISUP FGD terminating agency
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