QSIG

QSIG is an ISDN based signaling protocol for signalling between private branch exchanges (PBXs) in a Private Integrated Services Network (PISN). It makes use of the Q.931 and ROSE protocols.

QSIG was originally developed by ETSI and is defined by a set of ISO standard documents, so is not owned by any one company. This allows interoperability between communications platforms provided by disparate vendors.

QSIG has two layers, called BC (basic call) and generic function (GF). QSIG BC describes how to set up calls between PBXs. QSIG GF provides supplementary services for large-scale corporate, educational, and government networks, such as line identification, call intrusion and call forwarding. Thus for a large or very distributed company that requires multiple PBXs, users can receive the same services across the network and be unaware of the switch that their telephone is connected to. This greatly eases the problems of management of large networks.

List of QSIG standards

• ETS 300 052 - Multiple Subscriber Number
• ETS 300 055 - Call Waiting
• ETS 300 092 - Calling Line Identification Presentation (CLIP)
• ETS 300 093 - Calling Line Identification Restriction (CLIR)
• ETS 300 097 - Connected Line Identification Presentation (COLP)
• ETS 300 098 - Connected Line Identification Restriction (COLR)
• ETS 300 130 - Malicious Call Identification
• ETS 300 141 - Call Hold
• ETS 300 182 - Advice Of Charge
• ETS 300 188 - Three Way Conference
• ETS 300 207 - Call Diversion
• ETS 300 258 - Path Replacement (ANF-PR)
• ETS 300 260 - Call Transfer By Join (SS-CT)
• ETS 300 359 - Call Completion To Busy Subscriber (CCBS)
• ETS 300 369 - Explicit Call Transfer

Source : European Telecommunications Standards Institute (ETSI)

See also

• H.450

External links

• Online QSIG Decoder from Linkbit, Inc.