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ETSI ETS 300 192
- Private Telecommunication Network (PTN); Signalling protocol at the S-reference point; Circuit mode basic services
- standard by European Telecommunications Standards Institute, 12/01/1992
- Publisher: ETSI
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Stage 3 for basic call at S ref pt. See ENV41004 for definition of S ref pt. & 41005 for defn of stage 3.