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- ISDN_User_Part abstract "The ISDN User Part or ISUP is part of the Signalling System No. 7 (SS7) which is used to set up telephone calls in the public switched telephone network (PSTN). It is specified by the ITU-T as part of the Q.76x series.When a telephone call is set up from one subscriber to another, several telephone exchanges could be involved, possibly across international boundaries. To allow a call to be set up correctly, where ISUP is supported, a switch will signal call-related information like called party number to the next switch in the network using ISUP messages.The telephone exchanges may be connected via E1 or T1 trunks which transport the speech from the calls. These trunks are divided into 64 kbit/s timeslots, and one timeslot can carry exactly one call. Regardless of what facilities are used to interconnect switches, each circuit between two switches is uniquely identified by a circuit identification code (CIC) that is included in the ISUP messages. The exchange uses this information along with the received signaling information (especially the called party number) to determine which inbound and outbound circuits should be connected together to provide an end to end speech path.In addition to call related information, ISUP is also used to exchange status information for, and permit management of, the available circuits. In the case of no outbound circuit being available on a particular exchange, a release message is sent back to the preceding switches in the chain.".
- ISDN_User_Part wikiPageExternalLink en.
- ISDN_User_Part wikiPageExternalLink en.
- ISDN_User_Part wikiPageID "528563".
- ISDN_User_Part wikiPageRevisionID "605359962".
- ISDN_User_Part hasPhotoCollection ISDN_User_Part.
- ISDN_User_Part subject Category:Application_layer_protocols.
- ISDN_User_Part subject Category:Integrated_Services_Digital_Network.
- ISDN_User_Part subject Category:Signaling_System_7.
- ISDN_User_Part type Abstraction100002137.
- ISDN_User_Part type ApplicationLayerProtocols.
- ISDN_User_Part type Communication100033020.
- ISDN_User_Part type Direction106786629.
- ISDN_User_Part type Message106598915.
- ISDN_User_Part type Protocol106665108.
- ISDN_User_Part type Rule106652242.
- ISDN_User_Part comment "The ISDN User Part or ISUP is part of the Signalling System No. 7 (SS7) which is used to set up telephone calls in the public switched telephone network (PSTN). It is specified by the ITU-T as part of the Q.76x series.When a telephone call is set up from one subscriber to another, several telephone exchanges could be involved, possibly across international boundaries.".
- ISDN_User_Part label "ISDN User Part".
- ISDN_User_Part label "ISUP".
- ISDN_User_Part label "ISUP".
- ISDN_User_Part sameAs ISDN_User_Part.
- ISDN_User_Part sameAs ISUP.
- ISDN_User_Part sameAs m.02ly4t.
- ISDN_User_Part sameAs Q3491978.
- ISDN_User_Part sameAs Q3491978.
- ISDN_User_Part sameAs ISDN_User_Part.
- ISDN_User_Part wasDerivedFrom ISDN_User_Part?oldid=605359962.
- ISDN_User_Part isPrimaryTopicOf ISDN_User_Part.