Grandstream Networks HT503 User Manual page 8

Fxs/fxo port analog telephone adaptor
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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.
FIRMWARE VERSION 1.0.9.1
HT503 USER MANUAL
Page 8 of 59

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