ITU Q.939:1993
ITU Q.939:1993 Typical Dss 1 Service Indicator Codings For Isdn Telecommunications Services
Table of Contents
1Introduction2Scopeandobjective
3Listoftelecommunicationsservicesandspecificuser
applicationscoveredbycodings
4Generalprinciplesapplicabletoallservices
5Impactofinterworkingsituations
5.1Incomingcallsfromnon-ISDNs
5.2BCandLLCapplicationguidelines
6Requestandrecognitionofabasictelecommunications
serviceinanISDNenvironment
6.1Requestandrecognitionofacircuit-modebearer
service
6.1.1Circuit-mode64kbit/s8kHzstructuredbearer
servicecategoryusableforspeech
informationtransfer
6.1.2Circuit-mode64kbit/sunrestricted8kHz
structuredbearerservicecategory
6.1.3Circuit-mode64kbit/s8kHzstructuredbearer
servicecategoryusablefor3.1kHzaudio
informationtransfer
6.1.4Circuit-mode64kbit/s8kHzstructured
multi-usebearerservicecategory
6.1.5Circuit-modemulti-ratebearerservicefor
anISDNinterface
6.2Packet-modebearerservicescategories
6.2.1Virtualcallbearerservices[supportof
X.25terminalequipmentallowingaccessto
theISDNvirtualcircuitservice(caseBof
RecommendationX.31)]
6.2.2Framemodebearerservices
6.3Requestandrecognitionofateleservice
6.3.1Telephonyteleservice(3.1kHzbandwidth)
6.3.2Teletexservice(usingcircuit-modebearer
capability)
6.3.3TelefaxG4service(usingcircuit-modebearer
capability)
6.3.4ISDNsyntax-basedVideotexservice
6.3.5ISDNVideotelephonyteleservice
6.3.6Facsimilegroup2/3
7Codingsapplicabletospecificuserapplications
7.1Specificuserapplicationsofthecircuit-mode64
kbit/sunrestricted8kHzstructuredbearerservice
7.1.1SupportofterminaladaptorsV.110andX.30
7.1.2SupportofterminaladaptorsV.120
7.1.3SupportofX.25terminalequipmentallowing
accesstoPSPDNviaAU(caseAof
RecommendationX.31)
7.2Specificuserapplicationsofthecircuit-mode64
kbit/s8kHzstructuredbearerservicecategory
usablefor3.1kHzaudioinformationtransfer
7.2.1Voice-banddataviamodem
8CodingsforcallsoriginatinginaPSTN
9Abbreviations