0x0001 Alerting
0x0002 ISDN Progress
0x0003 ISDN Connect
0x0004 ISDN Disconnect
0x0006 ISDN User Information
0x0007 ISDN Facility
0x000A † ISDN Register
0x000C ISDN Notify
0x000D ISDN Information
0x0020 ISDN Vari-A-Bill
0x0021 ISDN -on-Demand
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0x0001 * ISDN Alerting
0x0002 * ISDN Progress
0x0003 * ISDN Connect
0x0004 * ISDN Disconnect
0x0005 * ISDN Release (Complete)
0x0006 ISDN User Information
0x0007 ISDN Facility
0x0008 ISDN Facility
0x0009 ISDN Facility Reject
0x000A † ISDN Register
0x000C ISDN Notify
0x000D ISDN Information
0x0013 More Information (L3P to L3)
0x0014 Call Proceeding Indication (L3P to L3)
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