European Telecommunications Standards Institute (ETSI)
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ETSI ETS 300 099-1998
ETSI ETS 300 099-1998 history
1998ETSI ETS 300 099-1998 Integrated Services Digital Network (ISDN); Specification of the Packet Handler Access Point Interface (PHI) (Second Edition;)
1992ETSI ETS 300 099-1992 Integrated Services Digital Network (ISDN); Specification of the Packet Handler Access Point Interface (PHI)