"The development of signaling@ media@ security and other interoperability technical requirements and specifications by other ATIS committees@ e.g.@ PSTC@ will drive the ordering information exchange needs and specifications to be documented and maintained by the Ordering Solutions Committee. Although mechanization of this process is outside the scope of this document@ sufficient experience with the manual forms and processes described herein may lead to a stable and widely employed process warranting mechanization. Subsequent documents will address any corresponding mechanized requirements for managing and exchanging information. This document serves as the repository for the specification (and its development) for information exchanged manually using ordering forms identifying ordering attributes for Layer 3 and above SIP-based voice connections. This specification assumes layer 1 and 2 attributes@ although included in the ""Data Worksheet""@ will be processed through existing OBF ordering procedures@ and are not impacted herein. Purpose The purpose is for this document is to serve as the baseline industry specification for SIPbased voice interworking and to be a placeholder for ongoing analysis and decisions determined by NGN Providers and the ATIS committees responsible for further developing this uniform ""industry specification@"" including the process@ worksheets@ job aids and reference material used to facilitate the planning and implementation of NGN SIP-based voice interoperability."