Grandstream ht-503 User Manual

 

Grandstream Networks, Inc. 

Page 5 of 37  

The HT503 ATA package contains: 
 

•  One HT503  Main Case 

•  One Universal Power Adaptor 

•  One Ethernet Cable 

•  One HT503 Vertical Stand 

 

The HT503 Analog Telephone Adaptor is an all-in-one VoIP integrated device designed to be a total 
solution for networks providing VoIP services.  The HT503 VoIP features and functions are available 
using a regular analog telephone.  
 

503 has one

The HT

 FXS port and one FXO port.  The PHONE port next to the power supply is an FXS 

port. The LINE port on the back right of the HT503 is an FXO port.  Both the FXS port and the FXO port 
can have a separate SIP account.  This is a key feature of HT503 as it supports simultaneous calls on 
both the FXS port and FXO port.  Telephone calls can be originated from or terminated on the PSTN 
network remotely via the FXO port.  

 
 

Power adapter connection   

Connect the LAN port with an Ethernet cable to your PC. 

Connect the WAN port to the internal LAN network or router. 

FXS port to be connected to analog phones / fax machines. 

FXO port should be connected to the PSTN line