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QSIG B Private Networking
Administration for Network Connectivity
CID: 77730 555-233-504 — Issue 1 — April 2000
370
NCA-TSC An NCA-TSC is a connection not related with any ISDN B-channel connections.
DECINITY ECS supports two types of NCA-TSC that conform to two different
protocol standards:
• The non-QSIG AT&T type of NCA-TSC is used for the DCS over ISDN-PRI
D-channel and DCS AUDIX applications. Only ISDN-PRI Signaling Groups
administered with Supplementary Service Protocol a support AT&T NCA-TSCs.
For further information, see page 322.
• The QSIG type of NCA-TSC is used for certain QSIG features such as Call
Completion (Automatic Call Back). This type of NCA-TSC is referred to in the
QSIG protocol standards as a Call-Independent Signaling Connection (CISC).
Only ISDN-PRI Signaling Groups administered with Supplementary Service
Protocol b support QSIG NCA-TSCs. In addition, BRI trunk D-channels support
QSIG NCA-TSCs.
An NCS-TSC for QSIG is not administered ahead of time, but is invoked
dynamically by the QSIG feature that needs it. Some QSIG features remove the
NCA-TSC when it is no longer needed; others leave the it active for a longer
period of time.
DEFINITY ECS does not provide gateway functionality between a QSIG
NCA-TSC and an AT&T NCA-TSC. For example, although a call can be routed
from a DCS network into a QSIG network, it is not possible for the caller in this
case to invoke an automatic callback.