The IESG has approved the following document: - 'Modern Problem Statement, Use Cases, and Framework' (draft-ietf-modern-problem-framework-04.txt) as Informational RFC This document is the product of the Managing, Ordering, Distributing, Exposing, & Registering telephone Numbers Working Group. The IESG contact persons are Adam Roach, Alexey Melnikov and Ben Campbell. A URL of this Internet Draft is: https://datatracker.ietf.org/doc/draft-ietf-modern-problem-framework/ Technical Summary The functions of the public switched telephone network (PSTN) are rapidly migrating to the Internet. This is generating new requirements for many traditional elements of the PSTN, including telephone numbers (TNs). TNs no longer serve simply as telephone routing addresses: they are now identifiers which may be used by Internet-based services for a variety of purposes including session establishment, identity verification, and service enablement. This problem statement examines how the existing tools for allocating and managing telephone numbers do not align with the use cases of the Internet environment, and proposes a framework for Internet-based services relying on TNs. Working Group Summary There was some controversy when the MODERN working group was formed about the scope of work for the group. Discussions around these concerns resulted in clarifications of the architecture and requirements reflected in this document. In the end there was strong working group consensus on the contents of this document. Document Quality This document is an architecture and requirements document. As such, it does not define a protocol or anything that can be directly implemented. Personnel Steve Donovan is the Document Shepherd. Adam Roach is the Responsible Area Director. IESG Note This document is an informational use case and architecture document. The working group wishes to publish it as an RFC because it contains important terminology and concepts that will be referenced from the solutions RFCs.