Keypad protocol

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The keypad protocol is used in communication technology to call up and control switching-related performance features . The terminal sends control sequences and information to the exchange or the exchange information that is to be shown on the display to the terminal. For this, characters from the International Alphabet No. 5 (IA5) are used. The end device has no information about the features to be controlled. This “knowledge” lies entirely in the switching facility. The terminal only sends the key combination for the desired feature entered via the telephone keypad . This key combination is interpreted in the switching facility and the corresponding action is triggered.

In analog telephone technology, the keypad control is z. B. used to operate voice mailboxes .

literature

  • Gerd Siegmund: Network technology . Hüthig Verlag, Heidelberg 2002, ISBN 3-7785-3954-X .
  • ETSI EN 300 122 Integrated Services Digital Network (ISDN); Generic keypad protocol for the support of supplementary services; Digital Subscriber Signaling System No. one (DSS1) protocol