- for incoming calls, go CS_ROUTING only when number is dialed.
  CS_HIBERNATE before
- start media when both side have answered

Also:
- send tone for UNALLOCATED_NUMBER and USER_BUSY
- if channel variables are not sufficent to set call info, ask the
  partner channel

And try to keep each file below 2000 lines

Based on chan-sccp-b (file src/sccp_labels.h)

         add more debug logging
         fix signaling status return code in ftdm_io

- channel vars are caller_ and not callee_
- inbound/outbound are reversed from the skinny POV
- use displayname

fixed a typo in the MSVC inttypes.h file for spandsp