This example implies that in the channel_open / channel_open_failure
case we may want three ranges:
0x0000 0000 - 0xFDFF FFFF IETF / connection layer
0xFE00 0000 - 0xFEFF FFFF channel-type specific, numbers from
this range for channel-types with @domain in their names are
defined by the maintainer of the @domain. For channel-types
without an @domain are defined by IETF action, and these
numbers are allocated by IANA. This registery is currently
empty for all IETF defined channel-types.
0xFF00 0000 - 0xFFFF FFFF private range, used any way
implemention wants, may not interoperate with other non-standard
implementations, but will never conflict with a standard
implementation.