QSIG
Encyclopedia
QSIG is an ISDN
Integrated Services Digital Network
Integrated Services Digital Network is a set of communications standards for simultaneous digital transmission of voice, video, data, and other network services over the traditional circuits of the public switched telephone network...

 based signaling protocol
Signaling protocol
A signaling protocol is a type of protocol used to identify signaling encapsulation. Signaling is used to identify the state of connection between telephones or VOIP terminals . The following is a list of signaling protocols:...

 for signaling between private branch exchanges (PBXs) in a Private Integrated Services Network (PISN). It makes use of the connection-level Q.931
Q.931
ITU-T Recommendation Q.931 is ISDN's connection control protocol, roughly comparable to TCP in the Internet Protocol stack. Q.931 doesn't provide flow control or perform retransmission, since the underlying layers are assumed to be reliable and the circuit-oriented nature of ISDN allocates...

 protocol and the application-level ROSE
Remote operations service element protocol
The Remote Operations Service Element is the OSI service interface, specified in , that provides remote operation capabilities, allows interaction between entities in a distributed application, and upon receiving a remote operations service request, allows the receiving entity to attempt the...

 protocol. ISDN "proper" functions as the physical link layer.

QSIG was originally developed by Ecma International
Ecma International
Ecma International is an international, private non-profit standards organization for information and communication systems. It acquired its name in 1994, when the European Computer Manufacturers Association changed its name to reflect the organization's global reach and activities...

, adopted by ETSI and is defined by a set of ISO
International Organization for Standardization
The International Organization for Standardization , widely known as ISO, is an international standard-setting body composed of representatives from various national standards organizations. Founded on February 23, 1947, the organization promulgates worldwide proprietary, industrial and commercial...

 standard documents, so is not owned by any company. This allows interoperability between communications platforms provided by disparate vendors.

QSIG has two layers, called BC (basic call) and GF (generic function). 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
Call forwarding
Call forwarding , in telephony, is a feature on some telephone networks allowing an incoming call to a called party to be redirected to a third party. For example, the third party may be a mobile telephone, voicemail box or other telephone number where the desired called party is situated. It was...

. 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.

QSIG will likely never rival each vendor's private network protocols, but it does provide an option for a higher level of integration than that of the traditional choices.

List of QSIG standards

Note: This list is not complete. See the "source" after the list for more information.
  • ECMA-143 - Private Integrated Services Network (PISN) - Circuit Mode Bearer Services - Inter-Exchange Signalling Procedures and Protocol (QSIG-BC), Basic Call,
    International and European Versions: ISO/IEC 11572, ETSI EN 300 172
  • ECMA-165 - Private Integrated Services Network (PISN) - Generic Functional Protocol for the Support of Supplementary Services - Inter-Exchange Signalling Procedures and Protocol (QSIG-GF),
    International and European Versions: ISO/IEC 11582, ETSI ETS 300 239
  • ECMA-164 - Private Integrated Services Network (PISN) - Inter-Exchange Signalling Protocol - Name Identification Supplementary Services (QSIG-NA),
    International and European Versions: ISO/IEC 13868, ETSI ETS 300 238
  • ECMA-174 - Private Integrated Services Network (PISN) - Inter-Exchange Signalling Protocol - Call Diversion Supplementary Services (QSIG-CF),
    International and European Versions: ISO/IEC 13873, ETSI ETS 300 257
  • ECMA-178 - Private Integrated Services Network (PISN) - Inter-Exchange Signalling Protocol - Call Transfer Supplementary Service (QSIG-CT),
    International and European Versions: ISO/IEC 13869, ETSI ETS 300 261


Source : ECMA - list of standards (search the list for PISN to find all QSIG related standards at ECMA)

QSIG basically uses ROSE
Remote operations service element protocol
The Remote Operations Service Element is the OSI service interface, specified in , that provides remote operation capabilities, allows interaction between entities in a distributed application, and upon receiving a remote operations service request, allows the receiving entity to attempt the...

 to invoke specific supplementary service at the remote PINX. These ROSE
Remote operations service element protocol
The Remote Operations Service Element is the OSI service interface, specified in , that provides remote operation capabilities, allows interaction between entities in a distributed application, and upon receiving a remote operations service request, allows the receiving entity to attempt the...

 operations are coded in a Q.931
Q.931
ITU-T Recommendation Q.931 is ISDN's connection control protocol, roughly comparable to TCP in the Internet Protocol stack. Q.931 doesn't provide flow control or perform retransmission, since the underlying layers are assumed to be reliable and the circuit-oriented nature of ISDN allocates...

FACILITY info element. Here a list of QSIG opcodes:
opcode supplServ defining ECMA
0 callingName ECMA-164
1 calledName ECMA-164
2 connectedName ECMA-164
3 busyName ECMA-164
4 pathReplacePropose ECMA-176
5 pathReplaceSetup ECMA-176
6 pathReplaceRetain ECMA-176
7 callTransferIdentity ECMA-178
8 callTransferAbandon ECMA-178
9 callTransferInitiate ECMA-178
10 callTransferSetup ECMA-178
11 callTransferActive ECMA-178
12 callTransferComplete ECMA-178
13 callTransferUpdate ECMA-178
14 subaddressTransfer ECMA-178
15 activateDiversionQ ECMA-174
16 deactivateDiversionQ ECMA-174
17 interrogateDiversionQ ECMA-174
18 checkRestriction ECMA-174
19 callRerouteing ECMA-174
20 divertingLegInformation1 ECMA-174
21 divertingLegInformation2 ECMA-174
22 divertingLegInformation3 ECMA-174
23 cfnrDivertedLegFailed ECMA-174
27 ccnrRequest ECMA-186
28 ccCancel ECMA-186
29 ccExecPossible ECMA-186
30 ccPathReverse ECMA-186
31 ccRingout ECMA-186
32 ccSuspend ECMA-186
33 ccResume ECMA-186
34 callOfferRequest ECMA-192
35 doNotDisturbActivateQ ECMA-194
36 doNotDisturbDeactivateQ ECMA-194
37 doNotDisturbInterrogateQ ECMA-194
38 doNotDsturbOverrideQ ECMA-194
39 doNotDisturbOvrExecuteQ ECMA-194
40 ccbsRequest ECMA-186
41 pathRetain ECMA-192
42 serviceAvailable ECMA-192
43 callIntrusionRequest ECMA-203
44 callIntrusionGetCIPL ECMA-203
45 callIntrusionIsolate ECMA-203
46 callIntrusionForcedRelease ECMA-203
47 callIntrusionWOBRequest ECMA-203
48 callIntrusionCompleted ECMA-203
49 cfbOverride ECMA-192
54 ctmiEnquiry ECMA-215
55 ctmiDivert ECMA-215
56 ctmiInform ECMA-215
57 recallAlert ECMA-214
58 recallAnswered ECMA-214
59 chargeRequest ECMA-212
60 getFinalCharge ECMA-212
61 aocFinal ECMA-212
62 aocInterim ECMA-212
63 aocRate ECMA-212
64 aocComplete ECMA-212
65 aocDivChargeReq ECMA-212
66 cintLeginformation1 ECMA-221
67 cintLegInformation2 ECMA-221
68 cintCondition ECMA-221
69 cintDisable ECMA-221
70 cintEnable ECMA-221
80 mWIActivate ECMA-242
81 mWIDeactivate ECMA-242
82 mWIInterrogate ECMA-242
84 cmnRequest ECMA-251
85 cmnInform ECMA-251
86 pathReplaceInvite ECMA-176

List of ISDN 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 300 172 - Circuit-Mode Basic Service
  • ETS 300 173 - Called/Calling Line ID Presentation
  • ETS 300 182 - Advice Of Charge
  • ETS 300 188 - Three Way Conference
  • ETS 300 207 - Call Diversion
  • ETS 300 237 - Called/Calling Name Presentation
  • ETS 300 238 - Called/Calling Name Presentation
  • ETS 300 239 - Generic Functional Protocol
  • ETS 300 256 - CFU Supplementary Service
  • ETS 300 258 - Path Replacement (ANF-PR)
  • ETS 300 359 - Call Completion To Busy Subscriber (CCBS)
  • ETS 300 260 - Call Transfer By Join (SS-CT)
  • ETS 300 261 - Call Transfer - (SS-CT)
  • ETS 300 369 - Explicit Call Transfer
  • ETS 300 745 - Message Waiting Indication (MWI)
  • ETS 300 259 - Path Replacement Additional Network Feature (ANF-PR)
  • ETS 301 258 - Recall Supplementary Service (SS-RE)
  • ETS 301 919 - Single Step Call Transfer Supplementary Service (SS-SSCT)

Source : European Telecommunications Standards Institute (ETSI)
  • CCITT G.703 - Standard for transmitting Voice over digital carriers such as E1 or T1. This provides the specifications for pulse code modulation "PCM" at data rates from 64 kbit/s to 2.048 Mbit/s
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