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- Q.931 abstract "ITU-T Recommendation Q.931 is the ITU standard ISDN connection control signalling protocol, forming part of Digital Subscriber Signalling System No. 1. Unlike connectionless systems like UDP, ISDN is connection oriented and uses explicit signalling to manage call state: Q.931. Q.931 typically does not carry user data. Q.931 does not have a direct equivalent in the Internet Protocol stack, but can be compared to SIP. Q.931 does not provide flow control or perform retransmission, since the underlying layers are assumed to be reliable and the circuit-oriented nature of ISDN allocates bandwidth in fixed increments of 64 kbit/s. Amongst other things, Q.931 manages connection setup and breakdown. Like TCP, Q.931 documents both the protocol itself and a protocol state machine. Q.931 was designed for ISDN call establishment, maintenance, and release of network connections between two DTEs on the ISDN D channel. Q.931 has more recently been used as part of the VoIP H.323 protocol stack (see H.225.0) and in modified form in some mobile phone transmission systems and in ATM.A Q.931 frame contains the following elements: Protocol discriminator (PD) – Specifies which signaling protocol is used for the connection (e.g. PD=8 for DSS1) Call reference value (CR) – Addresses different connections which can exist simultaneously. The value is valid only during the actual time period of the connection Message type (MT) – Specifies the type of a layer 3 message out of the Q.931-defined Message type set for call control (e.g. SETUP). There are messages defined for the call setup, the call release and the control of call features. Information elements (IE) – Specify further information which is associated to the actual message. An IE contains the IE name (e.g. bearer capability), their length and a variable field of contents.↑ ↑".
- Q.931 wikiPageID "2421044".
- Q.931 wikiPageLength "8996".
- Q.931 wikiPageOutDegree "25".
- Q.931 wikiPageRevisionID "609000231".
- Q.931 wikiPageWikiLink Asynchronous_Transfer_Mode.
- Q.931 wikiPageWikiLink Bandwidth_(computing).
- Q.931 wikiPageWikiLink Broadband_Integrated_Services_Digital_Network.
- Q.931 wikiPageWikiLink Category:ITU-T_recommendations.
- Q.931 wikiPageWikiLink Category:Integrated_Services_Digital_Network.
- Q.931 wikiPageWikiLink Communications_protocol.
- Q.931 wikiPageWikiLink Connection-oriented_communication.
- Q.931 wikiPageWikiLink Connectionless_communication.
- Q.931 wikiPageWikiLink Data_rate_units.
- Q.931 wikiPageWikiLink Digital_Subscriber_System_No._1.
- Q.931 wikiPageWikiLink Finite-state_machine.
- Q.931 wikiPageWikiLink Flow_control_(data).
- Q.931 wikiPageWikiLink H.225.0.
- Q.931 wikiPageWikiLink H.323.
- Q.931 wikiPageWikiLink ITU-T.
- Q.931 wikiPageWikiLink Integrated_Services_Digital_Network.
- Q.931 wikiPageWikiLink Jitter.
- Q.931 wikiPageWikiLink Mobile_phone.
- Q.931 wikiPageWikiLink OSI_model.
- Q.931 wikiPageWikiLink Session_Initiation_Protocol.
- Q.931 wikiPageWikiLink Signaling_(telecommunications).
- Q.931 wikiPageWikiLink Telecommunication_circuit.
- Q.931 wikiPageWikiLink Traffic_management.
- Q.931 wikiPageWikiLink Transmission_Control_Protocol.
- Q.931 wikiPageWikiLink User_Datagram_Protocol.
- Q.931 wikiPageWikiLinkText "ITU-T Q.931".
- Q.931 wikiPageWikiLinkText "Q.931".
- Q.931 wikiPageUsesTemplate Template:Reflist.
- Q.931 subject Category:ITU-T_recommendations.
- Q.931 subject Category:Integrated_Services_Digital_Network.
- Q.931 hypernym Control.
- Q.931 type Place.
- Q.931 type Protocol.
- Q.931 type Redirect.
- Q.931 comment "ITU-T Recommendation Q.931 is the ITU standard ISDN connection control signalling protocol, forming part of Digital Subscriber Signalling System No. 1. Unlike connectionless systems like UDP, ISDN is connection oriented and uses explicit signalling to manage call state: Q.931. Q.931 typically does not carry user data. Q.931 does not have a direct equivalent in the Internet Protocol stack, but can be compared to SIP.".
- Q.931 label "Q.931".
- Q.931 sameAs Q1759250.
- Q.931 sameAs Q.931.
- Q.931 sameAs Q.931.
- Q.931 sameAs Q.931.
- Q.931 sameAs m.07bwp2.
- Q.931 sameAs Q.931.
- Q.931 sameAs Q1759250.
- Q.931 sameAs Q.931.
- Q.931 wasDerivedFrom Q.931?oldid=609000231.
- Q.931 isPrimaryTopicOf Q.931.