How the SR Works
       Introduction
       Distinctive Ring Service
       How The SR Works
Features
Applications
Safety Instructions
Installation
       Installation
       Single Line
             A. Simple Plug-In
             B. Wiring Modifications
             C. With Adapters
             D. Partial Supervision
             E. Multiple Sr's
             D. No Supervision but Easy
       Multiple Lines
             A. Before a Key System
             Two Line System (no KSU)
Commonly Asked Questions
Appendix
       Recommended Parts & Materials
       Technical Specifications
       FCC Registration
How to Buy?