Grandstream Networks HT503 FXS/FXO Manuel D’Utilisation

 

Restoring the Factory Default Setting will DELETE all configuration information of the 

phone. Please BACKUP or PRINT out all the settings before you approach to following steps. 
Grandstream will not take any responsibility if you lose all the parameters of setting and cannot connect 
to your VoIP service provider. 

 

Reset default factory settings using the IVR Prompt (Table 5): 

1.  Dial “***” for voice prompt. 

2.  Enter “99” and wait for “reset” voice prompt. 

3.  Enter the encoded MAC address (Look below on how to encode MAC address). 

4.  Wait 15 seconds and device will automatically reboot and restore factory settings. 

 

 

1.  Locate the MAC address of the device.  It is the 12 digit HEX number on the bottom of the 

unit. 

2.  Key in the MAC address.  Use the following mapping: 

0-9: 0-9 
a.  A: 22  (press the “2” key twice, “A” will show on the LCD) 
b.  B: 222 
c.  C: 2222 
d.  D: 33  (press the “3” key twice, “D” will show on the LCD) 
e. E: 

333 

f. 

F: 3333 

 
For example:  if the MAC address is 000b8200e395, it should be keyed in as “0002228200333395”. 

Initiate the Factory Reset procedure by pressing the RESET button located in back panel of the device for 
approximately 8 seconds.  All port LEDs will turn on and device will restart itself. 

 
NOTE: 
1.  Factory Reset will be disabled if the “Lock keypad update” is set to “Yes”. 
2.  Please be aware by default the HT503 WAN side HTTP access is disabled. After a factory reset, the 

device’s web configuration page can be accessed only from its LAN port. 

3.  If the HT503 was previously locked by your local service provider, pressing the RESET button will 

only restart the unit.  The device will not return to factory default settings. 

Grandstream Networks, Inc. 

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