[I]

[..]
  1. INDICATION_STRINGS
  2. INITIALIZED_MAGIC
  3. ISDN_FUNC_TRACE_ENTER
  4. ISDN_FUNC_TRACE_EXIT
  5. ISDN_PCAP_INCOMING
  6. ISDN_PCAP_INCOMING_BCAST
  7. ISDN_PCAP_OUTGOING
  8. IS_ACCEPTING_PENDING
  9. I_FRAME
  10. IsQ931Ext
[..]