Instruction manual

Networking and connectivity
555-233-767146 Issue 4 May 2003
QSIG
Basic
QSIG provides compliance to the International Standardization Organization
(ISO) ISDN-PRI private-networking specifications. QSIG is defined by ISO as
the worldwide standard for private networks. QSIG features are supported on BRI
trunks.
QSIG is the generic name for a family of signaling protocols. The Q-reference
point or interface is the logical point where signaling is passed between 2 peer
entities in a private network. QSIG signaling can provide feature transparency in a
single-vendor or multi-vendor environment.
QSIG provides call-related supplementary services. These are services that go
beyond voice or data connectivity and number transport and display. Examples of
supplementary services include name identification, call forwarding (diversion),
and call transfer.
Call completion
Call completion utilizes the QSIG platform enhancement call independent
signaling connections and is functionally equivalent to the Distributed
Communications System (DCS) feature: auto-callback. The call completion
feature includes a connection release method. The connection release method
clears the Temporary Signaling Connection (TSC) after each phase of
call-independent signaling and establishes a new TSC for each subsequent phase.
Call forwarding (diversion)
QSIG call forwarding (diversion) is based on the Communication Manager call
forwarding feature. It extends the feature transparency aspects of call forwarding
over a QSIG trunk:
■ If QSIG call forwarding is activated, all calls are diverted immediately.
■ If QSIG call forwarding with busy/don’t answer is activated and a station is
busy, a call is diverted immediately.
■ If QSIG call forwarding with busy/don’t answer is activated and a station is
idle but the call is not answered, a call is diverted after a specified number
of rings.
These features are activated either by dialing a Feature Access Code (FAC) or by
pressing a button. See ‘‘Call redirection’’ on page 209 for detailed descriptions of
how to use these features.