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Klaus-Peter Junghanns kpj at junghanns.netHi, ETSI TS 140 056 is what i was looking for. Fortunately it's only 16 pages and states a few differences to ETSI EN 300 125 (ISDN layer 2, Q.921). Mit freundlichen Grüßen -- best regards Klaus-Peter Junghanns -- Junghanns.NET Gesellschaft fuer Internet-Services & Software-Development mbH Breite Str. 13a 12167 Berlin Germany Geschaeftsfuehrer : Klaus-Peter Junghanns Eingetragen beim Amtsgericht Charlottenburg, HRB 79169 Finanzamt fuer Koerperschaften III, Steuernummer 29/409/8978 Umsatzsteuernummer : DE 217621658 WEEE-Reg.-Nr. DE 86102730