H.450

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H.450 refers to a set of standards created by the International Telecommunications Union (ITU) to define various features of the packet-based communications protocol known as H.323 . It emulates another standard known as QSIG that defines similar services for ISDN -based networks.

  • H.450.1 , Supplementary Services Framework, framework for additional performance features

The general mechanism for transporting performance features is explained in this paper. Features are exchanged using ROSE (Remote Operations Service Element).

  • H.450.2 , Call Transfer Supplementary Service, Connect calls

Explains how a party-B can convert an active call between party-A and party-B into a call between party-A and a new party-C.

  • H.450.3 , Call Diversion Supplementary Service, diverting calls

Explains how an IP telephone can divert calls to e.g. B. can activate a cell phone. Explains how an IP telephone can query whether call diversions have been set up.

  • H.450.4 , Call Hold Supplementary Service, put call on hold

Explains how a call can be put on hold and provided with music on hold.

  • H.450.5 , Call Park and Pickup Supplementary Service, Call Park and Repeat

Imagine a large department store in which a call comes in at reception for Ms. Schmidt. The reception parks the call and calls over the radio call system: "Ms. Schmidt, please 223". Ms. Schmidt moves to the nearest telephone, dials 223 and gets the call through.

  • H.450.6 , Call Waiting Supplementary Service, Call waiting

Explains how a second call to an IP telephone can be signaled that there is already an active call.

  • H.450.7 , Message Waiting Indication Supplementary Service, message waiting indication

Explains answering machine-related elements and how these can be implemented using H.323.

  • H.450.8 , Name Identification Supplementary Service, name display

Explains how names are displayed or how to deliberately call incognito.

  • H.450.9 , Call Completion Supplementary Service, callback

Explains how an automatic callback can be set up if a call destination is busy or temporarily absent and becomes available again later.

  • H.450.10 , Call Offer Supplementary Service

A variant of call waiting. Also known as "Camp-On".

  • H.450.11 , Call Intrusion Supplementary Service, intrusion on call

Explains how z. B. the secretary of a chairman of the board intends and allows to intrude on a call from her superior to communicate important information.

  • H.450.12 , Common Information Additional Network Feature for H.323, framework of further network functions

A means of exchanging various additional information between endpoints. E.g. whether certain functions are available and / or allowed.