Grandstream ht-503 User Manual

 

Grandstream Networks, Inc. 

Page 4 of 37  

Thank you for purchasing Grandstream’s HT503, the affordable, feature rich, Analog Telephone 
Adaptor/IAD. The HT503 combines a sleek design with the latest technology to offer more advanced 
telephony features and significantly better integrated router performance than its predecessor – the 
HT488.  It is the second ATA/IAD in the HandyTone 50x series.  The HT503 functions as a true 3-in-1 
gateway for PSTN network, analog telephone FXS interface and IP network. It enables remote call 
origination and termination from/to PSTN and supports the feature of “hop-on/hop-off” calling.  
 
This manual will help you learn how to operate and manage your HT503 Analog Telephone Adaptor/IAD 
and make the best use of its many upgraded features including simple and quick installation, 3-way 
conferencing, and remote call origination and “hop-on/hop-off” calling using the programmable PSTN 
FXO port.  This HT503 is very easy to manage and configure, and is specifically designed to be an easy 
to use and affordable VoIP solution for both the residential user and the remote user. 
 
This document is subject to changes without notice. The latest electronic version of this user manual can 
be downloaded from the following location: 

 

The HT503 adaptor complies with FCC/CE and various safety standards. The HT503 power adaptor is 
compliant with UL standard.  Only use the universal power adapter provided with the HT503 package.  
The manufacturer’s warranty does not cover damages to the phone caused by unsupported power 
adaptors. 
 

If you purchased your HT503 from a reseller, please contact them for replacement, repair or refund.  If 
you purchased the product directly from Grandstream, contact your Grandstream Sales and Service 
Representative for a RMA (Return Materials Authorization) number before you return the product.  
Grandstream reserves the right to remedy warranty policy without prior notification. 
 

 Changes or modifications to this product not expressly approved by Grandstream, or operation 

of this product in any way other than as detailed by this User Manual, could void your manufacturer 
warranty. 
 
 
 
 
 
 
 
 
 
 
•  This document is contains links to Grandstream GUI Interfaces.  Please remember to download these 

examples 

 for your reference. 

 
•  This document is subject to change without notice.  The latest electronic version of this user manual is 

available for download from the following location: 

 

•  Reproduction or transmittal of the entire or any part, in any form or by any means, electronic or print,