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Q.931

La recommandation Q.931 de l'UIT-T traite des procédures pour établir, maintenir et terminer une connexion RNIS.

Suite de protocoles RNIS
Couche Protocoles Canal D Protocoles Canal B
Signalisation Paquet Télémétrie Commut. circuit Semi permanent Commut. paquet
Application Utilisateurs
Présentation
Session
Transport
RĂ©seau Q.931 X.25.3 IP* X.25.3
Liaison Q.921 LAP-D HDLC*
PPP*
LAP-B
Physique Accès de base I.430, primaire I.431
* Protocoles non RNIS

Les fonctions et procédures sont décrites de manière générale dans les recommandations Q.930 et I.450.

Q.931

Q.931 est défini par l'UIT-T comme : "Spécification de la couche 3 de l'interface utilisateur-réseau RNIS pour la commande de l'appel de base". Il est un protocole de niveau 3 par rapport au modèle OSI. Il est chargé de l'établissement, du maintien et de la libération des connexions réseau. Il est utilisé au niveau de l'interface utilisateur-réseau.

Message Q.931

Message Signification Hex value Details
ALERT Alerting 01 Call establishment message.

Alerting of called user has been established.

CALL PROC Call proceeding 02

Call establishment message.

Requested call establishment has been initiated, and no more call establishment information will be accepted.

CON CON Congestion control 79

Miscellaneous message.

Establishment or termination of flow control on transmission of USER INFO.

CONN Connect 07

Call establishment message.

Call acceptance by the called user.

CONN ACK Connect acknowledge 0F

Call establishment message.

Acknowledges call connection to the called user and initiates the data communication phase.

DEACT Deactivate 37

Call information message.

Requests release of the B channel from the semi-permanent connection.

The connection is maintained but the B channel becomes available for use.

DEACT ACK Deactivate acknowledge 40

Call clearing message.

Sender has disconnected the B channel (but retains the call reference). The receiver should release the B channel (but retain the call reference).

DETACH Detatch 48

Call clearing message.

Acknowledges DETACH and indicates that the B channel has been released and is available for use (but the call reference has been retained).

DETACH ACK Detach acknowledge 45

Call clearing message.

Requests release of the B channel and the release of the call reference value.

DISC Disconnect 62

Miscellaneous message.

This message is sent to control network facilities.

FACILITY Facility 6A

Miscellaneous message.

Acknowledges FACILITY.

FAC ACK Facility acknowledge 7B

Miscellaneous message.

Provides additional information for call establishment or miscellaneous call-related information.

INFO Information 6E

Miscellaneous message.

Indicates information pertaining to a call.

PROGRESS Progress 03

Call establishment message.

Indicates the progress of a call in the event of interworking or the provision of in-band information.

REACT Reactivate 36

Call information message.

Requests connection to a deactivated semi-permanent connection.

REACT ACK Reactivate acknowledge 3E

Call information message.

Acknowledges REACT and indicates reconnection to a deactivated semi-permanent connection.

REACT REJ Reactivate reject 32

Call information message.

Acknowledges REACT and indicates failure to reconnect to a deactivated semi-permanent connection.

REG Register 64

Miscellaneous message.

Sent to the network independently from a call, to control facilities.

REG ACK Register acknowledge 66

Miscellaneous message.

Acknowledges REG and indicates completion of a non-call related facility control request.

REL Release 4D

Call clearing message.

Sender has disconnected the B channel and intends to release the call reference. The receiver should release the B channel and the call reference value, and abort any calls being set up on that channel.

REL COM Release complete 5A

Call clearing message.

Sender has released the B channel and the call reference value. The receiver then releases the call reference value.

RESTART Restart 46

Call clearing message.

Sent to request a restart (i.e. return to idle condition) of the indicated channel or interface.

RESTART ACK Restart acknowledge 2E

Call clearing message.

Acknowledges RESTART and indicates that the restart is complete.

RESUME Resume 26

Miscellaneous message.

Requests the resumption of a call which has been suspended via SUSPEND.

RESUME ACK Resume acknowledge 2E

Miscellaneous message.

Acknowledges RESUME and indicates the completion of a request to resume a suspended call.

RESUME REJ Resume reject 22

Miscellaneous message.

Acknowledges RESUME and indicates failure to resume a suspended call.

SETUP Set-up 05

Call establishment message.

Initiates call establishment.

SETUP ACK Set-up acknowledge 0D

Call establishment message.

Indicates that call establishment has been initiated and that additional information may be required.

STATUS Status 7D

Miscellaneous message.

Sent to report certain error conditions or in response to STATUS ENQ.

STATUS ENQ Status enquiry 75

Miscellaneous message.

Sent to solicit STATUS.

SUSPEND Suspend 25

Miscellaneous message.

Sent to request the suspension of a call.

SUSPEND ACK Suspend acknowledge 2D

Miscellaneous message.

Acknowledges SUSPEND and indicates completion of the request to suspend a call.

SUSPEND REJ Suspend reject 22

Miscellaneous message.

Acknowledges SUSPEND and indicates failure of a request to suspend a call.

USER INFO User information 20 Call information message.

Conveys information from one user to another during the active communication phase of a call.

Format d'un message Q.931

Message
8 7 6 5 4 3 2 1 Octet
Discriminateur de protocole 1
0 0 0 0 Longueur de la valeur de référence d'appel en octets 2
Valeur de la référence d'appel 3
0 Type de message etc.
autres éléments d'information, le cas échéant

Informations obligatoires

  • Discriminateur de protocole
  • RĂ©fĂ©rence d'appel
  • Type de message

Informations optionnelles

  • Changement de code
  • DonnĂ©es Ă  suivre
  • Fin de numĂ©rotation
  • Niveau d'encombrement
  • Indicateur de rĂ©pĂ©tition
  • Message fractionnĂ©
  • CapacitĂ© du support
  • Cause
  • IdentitĂ© de l'appel
  • État de l'appel
  • Identification du canal
  • Indicateur de progression
  • FonctionnalitĂ©s spĂ©cifiques au rĂ©seau
  • Indicateur de notification
  • Affichage
  • Date/heure
  • Fonction-clavier
  • Signal
  • DĂ©bit d'information
  • Temps de transit de bout en bout
  • SĂ©lection et indication du temps de transit
  • Paramètres binaires de la couche Paquet
  • Taille de la fenĂŞtre de la couche Paquet
  • Taille des paquets
  • Groupe fermĂ© d'utilisateurs
  • Indication de taxation Ă  l'arrivĂ©e
  • NumĂ©ro du demandeur
  • Sous-adresse du demandeur
  • NumĂ©ro du demandĂ©
  • Sous-adresse du demandĂ©

Autres utilisations de Q.931

Les messages décrits dans la recommandation Q.931 servent principalement dans l'environnement RNIS, GSM et SS7. Mais ils sont aussi utilisés dans la signalisation relais de trames avec le protocole Q.933 ou dans la signalisation ATM avec le protocole Q.2931. Les messages ont aussi été repris et intégrés dans le protocole H.323 et plus précisément dans la partie signalisation H.225.

Liens externes

T-REQ-Q.931 Document normalisant Q.931

Cet article est issu de wikipedia. Text licence: CC BY-SA 4.0, Des conditions supplémentaires peuvent s’appliquer aux fichiers multimédias.