Editing Open Services Access

The '''Open Service Access''' or '''OSA''' is part of the third generation mobile [[telecommunications]] network or [[UMTS]]. OSA describes how [[Service (systems architecture)|services]] are designed in a UMTS network.

The standards for OSA are being developed as part of the 3rd Generation Partnership Project ([[3GPP]]). The standards for OSA are published by [[ETSI]] and 3GPP.

The API for OSA is called [[Parlay X|Parlay]], (or Parlay/OSA or OSA/Parlay) as the APIs are developed jointly in collaboration by 3GPP, ETSI, and the Parlay Group. These APIs can be freely downloaded from the web. Sometimes OSA would be misspelled as Open Services ''Architecture'' or even confused with [[Open systems architecture]].

==See also==
* [[Parlay Group]]
* [[Customised Applications for Mobile networks Enhanced Logic|CAMEL]]
* [[IP Multimedia Subsystem]]
* [[Multitier architecture]]
* [[Service layer]]

==External links==
* [http://www.parlay.org/en/specifications/ Download APIs]
* [https://web.archive.org/web/20040704220531/http://docbox.etsi.org/TISPAN/Open/OSA/ The joint 3GPP/ETSI/Parlay work group]

[[Category:UMTS]]


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