DFARS 252.239-7000, Protection Against Compromising Emanations, requires the contractor to provide documentation that information technology used or provided under the contract meets information assurance requirements. DFARS 252,.239-7006, Tariff Information, requires the contractor to provide tariff-related information. DFARS 239.7408, requires the contracting officer to obtain a special construction proposal from a common carrier that submits a proposal that has special construction requirements related to the performance of basic telecommunication services.
The latest form for Defense Federal Acquisition Regulation Supplement (DFARS) Part 239, Acquisition of Information Technology, and associated clause at DFARS 252.239-7000 expires 2021-01-31 and can be found here.