Common ISDN Application Programming Interface: Difference between revisions
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The '''Common ISDN Application Programming Interface''' (short '''CAPI''') is an [[Integrated Services Digital Network|ISDN]]-conformant standardized [[software]] [[Interface (computer science)|interface]]. With the help of |
The '''Common ISDN Application Programming Interface''' (short '''CAPI''') is an [[Integrated Services Digital Network|ISDN]]-conformant standardized [[software]] [[Interface (computer science)|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]]. |
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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]]. |
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]]. |
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Through the [[European Telecommunications Standards Institute|ETSI]] CAPI 2.0 was introduced as standard ETS 300 324 (Profile B). |
Through the [[European Telecommunications Standards Institute|ETSI]], CAPI 2.0 was introduced as standard ETS 300 324 (Profile B). |
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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 |
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]]). |
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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. |
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. |
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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|VoIP]] ([[H.323]] and [[Session Initiation Protocol|SIP]]) exist, thus CAPI applications can be used directly on cutting edge communications infrastructure. Special extensions for protocol-specific features were defined several years ago for ATM. Specification extensions for [[Voip|VoIP]] (codec negotiation, advanced addressing etc.) will be available shortly. |
Besides popular signaling protocols for [[Integrated Services Digital Network|ISDN]], implementations of CAPI for [[Asynchronous transfer mode|ATM]], [[GSM]] and [[Voip|VoIP]] ([[H.323]] and [[Session Initiation Protocol|SIP]]) exist, thus CAPI applications can be used directly on cutting edge communications infrastructure. Special extensions for protocol-specific features were defined several years ago for ATM. Specification extensions for [[Voip|VoIP]] (codec negotiation, advanced addressing, etc.) will be available shortly. |
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== External links == |
== External links == |
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Revision as of 17:42, 7 March 2020
The Common ISDN Application Programming Interface (short CAPI) is an ISDN-conformant standardized 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.
CAPI was designed from 1989 by German manufacturers (AVM, Systec, Stollmann). Since 1991, CAPI is being developed further by CAPI Association e.V. Implementations exist for different operating systems, including Linux and Microsoft Windows.
Through the ETSI, CAPI 2.0 was introduced as standard ETS 300 324 (Profile B).
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, IVR, call center, voice conference systems, etc.), for fax servers and combined systems (UMS).
The CAPI Interface in its current release (CAPI 2.0) supports a variety of signaling protocols (D channel protocols), e.g. 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.
Besides popular signaling protocols for ISDN, implementations of CAPI for ATM, GSM and VoIP (H.323 and SIP) exist, thus CAPI applications can be used directly on cutting edge communications infrastructure. Special extensions for protocol-specific features were defined several years ago for ATM. Specification extensions for VoIP (codec negotiation, advanced addressing, etc.) will be available shortly.