Dialogic 6.2 Manuale Utente

Making Call Transfers Using QSIG

November 2009

184

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.

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: 

 and 

Calling Line Identification 
Restriction

Uses the 

 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.