This attribute specifies whether fast select calls may be received.
This attribute, if set to a value of allowed indicates that incoming
fast select calls (from the network to the DTE) can be made to this
DNA. If set to a value of disallowed, then such calls cannot be
made to this DNA - such calls will be cleared by the local DCE.
This attribute corresponds to the CCITT 'Fast Select Acceptance'
feature for DNAs in that incoming fast select calls are accepted if
this attribute is set to a value of allowed.
This attribute is ignored if the corresponding attribute, incCalls is
set to a value of disallowed.