Switching performance features (extensions)

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In the case of non-public telecommunication networks or telephone systems , subscriber-related services additionally made available by the private network, which are made available via the simple connection establishment and disconnection by the caller, the so-called A- , are called switching-related performance features ( English supplementary services ), or service features for short . Participant to go out to the called participant (B-participant).

Non-public telecommunications networks with their own service features that differ from the public telecommunications network and their own numbering plans are, for example, the telephone networks of the Bundeswehr or Deutsche Bahn ( BASA ) in Germany. Service features in such networks are partially only compatible with those of the public telecommunications network to a limited extent, but also have additional performance features that are not known in the public telecommunications networks, such as preemption, for example .

Private branch exchanges consisting of one or more telephone systems support additional service features that are specially provided for fast and uncomplicated communication, for example speed dialing, manager-secretary functions or internal operator functions.

Features for extensions

Certain performance features are mostly used on extensions of telephone systems. Logical extensions can also be simulated in exchanges if required ( Centrex ).

User groups ( PICKUP )

Telephones can be combined into groups. If a telephone in the group rings , the call can be picked up with a key combination . This feature can be used in particular if the relevant workstation is currently not occupied. The grouping is mainly used in larger companies when not everyone is allowed to pick up every conversation. In a telephone system with more than 100 participants, it is not always clear which phones are ringing and which call is being picked up.

Hold ( Hold )

A subscriber can put a call on hold by pressing a key combination on the extension. A call held in this way can then be continued from another phone or from the same phone using a key combination. As a rule, the subscriber on hold hears music on hold as long as he is on hold.

Call Barring ( Call Barring )

This feature is available for both incoming and outgoing connections. This means that certain authorizations can be defined for each participant (for example internal, local, national, international, value-added services). In the case of incoming connections, certain callers can be connected directly to the answering machine (detection using CLIP ) or a busy line can be simulated. This role is also known as the mother-in-law role .

Automatic call distribution ( ACD )

Several internal subscribers are combined to form a call group. This call group can be reached from outside via a telephone number. Incoming calls are put through to an internal subscriber in the call group (called "agent") according to certain rules. All participants in the group have the option of logging in and out of the call group. This feature is used in call centers so that you are always put through to a free agent. There is also the possibility of holding a certain number of callers on hold until an agent is free.

Call waiting

If call waiting (switching on or off with a certain key combination) is allowed for the called subscriber, i.e. it is switched on, the caller receives a dial tone, even if a call is in progress. The incoming second call is signaled with an advisory tone, the call waiting tone. If call waiting is not allowed, i.e. is switched off, the caller hears a busy signal.

literature

  • Peter Bocker: ISDN The service-integrated digital communication network . Springer Verlag, Berlin / Heidelberg 1987, ISBN 3-662-08032-X .
  • Otfried Georg: Telecommunication technology . A practical introduction, Springer Verlag, Berlin / Heidelberg 1996, ISBN 978-3-540-61381-7 .
  • Volker Jung, Hans-Jürgen Warnecke (Hrsg.): Handbook for telecommunications . Springer Verlag, Berlin / Heidelberg 1998, ISBN 978-3-642-97703-9 .

See also

Web links