http://www.rfc-editor.org/rfc/rfc2689.txt
RFC 2689: Providing Integrated Services over Low-bitrate Links, C. Bormann1999-09-01T23:00:00-00:00This document describes an architecture for providing integrated services over low-bitrate links, such as modem lines, ISDN B-channels, and sub-T1 links. This memo provides information for the Internet community.