User's Guide
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HT81x User Guide 
DOCUMENT PURPOSE 
This document describes the basic concept and tasks necessary to use and configure your HT81X. And it 
covers  the  topic  of  connecting  and  configuring  the  HT81X,  making  basic  operations  and  the  call 
features.Please  visit  http://www.grandstream.com/support  to  download  the  latest  “HT81XAdministration 
Guide” to have more visibility about the configurable settings of your HandyTones. 
This guide covers following topics: 
  Product overview. 
  Getting started. 
  Configuration guide. 
  Call features. 
  Call operations. 
  Upgrading and provisioning. 
  Restore factory default settings. 










