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ETSI TR 103 277 describes guidelines for the production of TTCN-3 libraries for protocol families or whole technologies. TTCN-3 is the Testing and Test Control Notation version 3 as defined in ETSI ES 201 873-1 [i.1].

The guidelines are based on the overhaul work performed on two TTCN-3 libraries that have been in use for several years in the production of abstract test suites (ATS) for testing IMS components: LibSip and LibIms.

LibSip is a collection of reusable TTCN-3 definitions related to SIP standards including type definitions for the SIP base IETF RFC 3261 [i.3] and other RFCs extending the scope, SIP templates and functions for sending and receiving SIP requests and answers.

LibIms is a collection of reusable TTCN-3 definitions extending LibSip to cover IMS specific aspects as defined in ETSI TS 124 229 [i.2]. LibIms is made up of TTCN-3 modules that extend the modules of LibSip from IETF style SIP as found in IETF RFC 3261 [i.3] to IMS SIP as described in ETSI TS 124 229 [i.2].