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ISDN:Specification

The ISDN protocol layer conforms to the following standards:

  • ITU-T Q.920
  • ITU-T Q.921
  • ITU-T Q.931
  • ETS 300 102
  • ETS 300 125
  • ETS 300 403-1, 403-2, 403-3
  • AT&T TR 41459
  • TS-013 and TS-014


TelcoBridges' implementation of ISDN supports the following switch variants:

  • Q.921 LAPD
  • Q.931 ISDN PRI
    • NI-2
    • Lucent 4ESS
    • Lucent 5ESS
    • Nortel DMS-100
    • Nortel DMS-250
    • Euro ISDN ETSI NET5 (French, German, UK, China, Hong-Kong, and Korea)
    • Euro Numeris (VN6)
    • Japanese NTT INS-NET1500
    • Australian