http://70.231.62.181/index.php?action=history&feed=atom&title=Common_ISDN_Application_Programming_InterfaceCommon ISDN Application Programming Interface - Revision history2026-04-23T06:03:01ZRevision history for this page on the wikiMediaWiki 1.45.1http://70.231.62.181/index.php?title=Common_ISDN_Application_Programming_Interface&diff=11022409&oldid=previmported>PhotographyEdits: use https link, official web template2025-12-20T17:38:49Z<p>use https link, official web template</p>
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The '''Common ISDN Application Programming Interface''' (short '''CAPI''') is an [[Integrated Services Digital Network|ISDN]]-conformant standardized [[Interface (computer science)|software interface]]. With the help of CAPI, [[computer]] software intended for the use with ISDN can be provided, without knowledge of the deployed, proprietary [[ISDN card]].<br />
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CAPI was designed from 1989 by [[Germany|German]] manufacturers ([[AVM GmbH|AVM]], Systec, Stollmann). Since 1991, CAPI is being developed further by ''CAPI Association e.V.'' [[Implementation]]s exist for different [[operating system]]s, including [[Linux]] and [[Microsoft Windows]].<br />
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Through the [[European Telecommunications Standards Institute|ETSI]], CAPI 2.0 was introduced as standard ETS 300 324 (Profile B).<br />
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Primarily, CAPI was designed for data transfer over [[ISDN]]. The specification has been extended multiple times, thereby it became important to the area of voice and fax communication. Because pure data transfer over IP-based networks is dominant in modern times, CAPI is being used primarily in the scope of voice applications (voice mail, [[Interactive voice response|IVR]], call center, voice conference systems, etc.), for fax servers and combined systems ([[Unified Messaging|UMS]]).<br />
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The CAPI Interface in its current release (CAPI 2.0) supports a variety of [[signaling protocol]]s ([[D channel]] protocols), e.g. [[Digital Subscriber System No. 1|DSS1]] and [[FTZ 1 TR 6]]. The interface operates in the [[OSI model]] between layer 3 and 4, but only controls layers 1 to 3.<br />
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Besides popular signaling protocols for [[Integrated Services Digital Network|ISDN]], implementations of CAPI for [[Asynchronous Transfer Mode|ATM]], [[GSM]] and [[VoIP]] ([[H.323]] and [[Session Initiation Protocol|SIP]]) exist, thus CAPI applications can be used directly on communications infrastructure. Special extensions for protocol-specific features were defined several years ago for ATM.<br />
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== External links ==<br />
* {{Official website|https://www.capi.org}}<br />
* [https://github.com/larsimmisch/capisuite CapiSuite] A Python scriptable ISDN telephony suite with an answering machine.<br />
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[[Category:Integrated Services Digital Network]]</div>imported>PhotographyEdits