Description: This is the i'th ITU-T facility required for this direct call. Within the provisioning system, the user specifies the facility code along with the facility parameters. The facility is represented internally as a hexadecimal string following the X.25 ITU-T representation for facility data. The user specifies the facility code when adding, changing or deleting a facility. The upper two bits of the facility code indicate the class of facility. From the class of the facility, one can derive the number of bytes of facility data, as follows: Class A - 1 byte of fax data Class B - 2 bytes of fax data Class C - 3 bytes of fax data Class D - variable length of fax data.