Identifies the category of virtual service requested.
VALID ENTRIES:
C = Cell Relay (ATM)
F = Frame Relay
NOTE 1: When the valid entry is “C”, the VST field on the VC Form must be blank or “B”.
NOTE 2: When the valid entry is “F”, the VST field on the VC Form must be blank, “A” or “C”.
USAGE: This field is conditional.
NOTE 1: Required when the first position of the REQTYP field on the ASR Form is “V” and the NC field does not specify an Ethernet-based port, otherwise prohibited.
DATA CHARACTERISTICS: 1 alpha character
EXAMPLE: F