Essential MSA, SOW, NDA templates. Each SOW will list all fees to be invoiced for the project(s) and Services described in each SOW ("Project Fees").The SOW authorizes Agency to commence performing any Services as of the Effective Date. Once the SOW is approved, attach it to the contract, give copies to the project team, and file an original signed copy in the project binder. You agree to pay the fees, costs, and expenses described in each SOW. You agree to pay the fees, costs, and expenses described in each SOW. What is a "Call-Off Contract"? Service. 4475 Union Road. Tiffton. There is a master contract that will be used for multiple project phases or deliverables. It may be a standalone agreement or incorporated into an MSA.