QSIG

B Private Networking

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-QSIGAT&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.

 

 

Administration for Network Connectivity

370

CID: 77730

555-233-504 — Issue 1 — April 2000

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Lucent Technologies Release 8.2 manual Protocol standards