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Making Call Transfers Using QSIG
November 2009 184
Making Call Transfers Using QSIG
ISDN QSIG
QSIG is an ISO standard that defines the ISDN signaling and
control methods used to link PBXs in private ISDN networks. The
standard extends the “Q” point in the ISDN logical reference model,
which was established by the ITU-T in its Q.93x series of
recommendations that defined the basic functions of ISDN switching
systems.
QSIG is an ISDN based protocol for signaling between nodes of a
Private Integrated Services Network (PISN). In particular, QSIG
allows compatibility among products in a multi-vendor environment.
QSIG is only specified for the ISDN Interface Type Point-to-Point,
that is you cannot configure or use this protocol in conjunction with a
Point-to-Multi-Point interface.
Supplementary Services Support
QSIG supports the following supplementary services:
Calling Line Identification Presentation (Caller ID)
Calling Line Identification Restriction
Advice of Charge
Call Diversion (Unconditional, Busy and Not Responding)
Call Transfer
Name Identification
This service uses the same caller ID functions that are used with
other protocols:
BfvLineWaitForCall and BfvCallWaitForSetup.
Calling Line Identification
Restriction
Uses the BfvCallSetup function which allows the Bfv application to
set call presentation and screening on a per call basis.
Advice of Charge (AOC) Supplementary service enables a user to receive information on the
recorded charges for a call when the call is terminated.