This document provides an installation and configuration guide for TekRADIUS Rate Editor version 4.8. It discusses how TekRADIUS Service Provider Edition supports VoIP billing features through RADIUS. The Rate Editor is used to create rate tables for VoIP services and imports/exports rate entries. TekRADIUS calculates authorized credits and charged amounts based on user credit, call price, duration, and billing resolution. The guide also provides notes on configuring TekSIP SP edition to work with a RADIUS server like TekRADIUS for SIP session control and VoIP authorization.