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ITU-T X.638 (10/1996)

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Minimal OSI facilities to support basic communications applications
This Recommendation provides the concepts, definitions and profile of the minimal upper layer facilities necessary to support basic connection-oriented communications applications. These facilities consist of a subset of the facilities defined in the ACSE, and the Presentation and Session service definitions. A basic communications application simply requires the ability to open and close communications with a peer and to send and receive messages with that peer. It is expected that a large portion of OSI applications will be satisfied by such minimal functionality.This is one of a series of Recommendations to support the minimal OSI functions in the upper layers. It is technically aligned with ISO/IEC ISP 11188-3.
Citation: https://handle.itu.int/11.1002/1000/3770
Series title: X series: Data networks, open system communications and security
  X.600-X.699: OSI networking and system aspects
  X.630-X.639: Efficiency
Approval date: 1996-10-05
Identical standard:ISO/IEC ISP11188-3:1996 (Twinned)
Provisional name:X.mosi
Approval process:TAP
Status: In force
Maintenance responsibility: ITU-T Study Group 17
Further details: Patent statement(s)