45 CFR § 1158.200 - Agency and legislative liaison.
(a) The prohibition on the use of appropriated funds, in § 1158.100 (a), does not apply in the case of a payment of reasonable compensation made to an officer or employee of a person requesting or receiving a Federal contract, grant, loan, or cooperative agreement if the payment is for agency and legislative liaison activities not directly related to a covered Federal action.
(c) For purposes of paragraph (a) of this section, the following agency and legislative liaison activities are allowable at any time only where they are not related to a specific solicitation for any covered Federal action:
(d) For purposes of paragraph (a) of this section, the following agencies and legislative liaison activities are allowable only where they are prior to formal solicitation of any covered Federal action:
(2) Technical discussions regarding the preparation of an unsolicited proposal prior to its official submission; and,
(e) Only those activities expressly authorized by this section are allowable under this section.