User's Manual

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Table Of Contents

FIRMWARE VERSION 1.0.9.1 HT503 USER MANUAL Page 8 of 59

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:

http://www.grandstream.com/products/ht_series/ht503/documents/ht503_usermanual_english.pdf

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

for any purpose without the express written permission of Grandstream Networks, Inc. is not

permitted.