This group defines attributes associated with a direct call. It defines
connection in terms of path and call option parameters. This
connection can be permanent (PVC), switched (SVC), or switched
permanent (SPVC). It can have four facilities:
- CCITT Facilities
- DTE Facilities
- National Facilities
- International Facilities
The total number of bytes of facilities including the facility codes
and all of the facility data from all of the four classes of facilities
must not exceed 512 bytes.