0x0001 ISDN Alerting
0x0002 ISDN Progress
0x0003 ISDN Connect
0x0004 ISDN Disconnect
0x0006 ISDN User Information
0x0007 ISDN Facility
0x0014 SUSPEND Request**
0x0015 SUSPEND ACK Request**
0x0016 SUSPEND REJECT
Request**
0x0017 RESUME Request **
0x0018 RESUME ACK Request**
0x0019 RESUME REJECT
Request**
0x000A † ISDN Register
0x000C ISDN Notify
0x000D ISDN Information
0x0020 ISDN Vari-A-Bill
0x0021 ISDN ANI-on-Demand

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 ACK
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)
0x0020 SUSPEND**
0x0021 RESUME**
0x0022 SUSPEND ACK**
0x0023 SUSPEND REJECT**
0x0024 SUSPEND TIMEOUT**
0x0025 RESUME ACK**
0x0026 RESUME REJECT**
0x0027 RESUME TIMEOUT**