ENUM Call Flows for VoIP Interworking

摘要

This document provides illustrations of the use of ENUM [2]functionality and identifies issues associated with such use. Toaccomplish this objective, the document presents service-level callflows for Voice over IP communication where interworking between thePSTN and IP-based networks are necessary to complete a call. Detailsare presented for simple calls made on a 焏irect dial?basis. Formore complicated calls, those requiring number portability orinteractive call processing (e.g., freephone), the issues aredescribed with the intent of working through those issues insubsequent drafts. The document does not propose that the examplesrepresent the only or best approach for interworking between thePSTN and IP-based networks.