User's Manual
FIRMWARE VERSION 1.0.0.2     GXW42XX USER MANUAL      Page 31 of 52 
Use STUN to detect 
network connectivity 
Use STUN keep-alive to detect WAN side network problems. If keep-alive request does 
not yield any response for configured number of times, the device will restart the 
TCP/IP 
stack. If the STUN server does not respond when the device boots up, the 
feature is 
disabled. 
Firmware Upgrade & 
Provisioning 
Enables GXW42XX to download firmware or configuration file using either the TFTP or 
HTTP/S protocols. 
Via TFTP Server 
This is the IP address of the configured TFTP server. If selected and it is non-zero or 
not blank, the GXW42XX retrieves the new configuration file or new code image from 
the specified TFTP server at boot time. After 5 attempts, the system will timeout and 
then it will start the boot process using the existing code image in the Flash memory. If 
a TFTP server is configured and a new code image is retrieved, the new downloaded 
image is saved into the Flash memory. 
Note:  Do NOT interrupt the firmware upgrade process (especially the power 
supply) as this will damage the device. Depending on the network environment this 
process may take up to 15 or 20 minutes. 
Via HTTP or HTTPS 
Server 
The URL for the HTTP server used for firmware upgrade and configuration via HTTP. 
Note: If Auto Upgrade is set to No, GXW42XX will only do HTTP download once at 
boot up. 
Firmware Server Path 
IP address or domain name of firmware server. That URL of the server that hosts the 
firmware release. The default server is: fm.grandstream.com/gs 
Config Server Path 
IP address or domain name of configuration server. The server hosts a copy of the 
configuration file to be installed on the gateway. The default server is: 
fm.grandstream.com/gs 
XML Config File 
Password 
The password used for encrypting the XML configuration file using OpenSSL. 
This is required for the phone to decrypt the encrypted XML configuration file. 
HTTP/HTTPS User Name  The user name needed to authenticate withthe HTTP/HTTPS server. 
HTTP/HTTPS Password 
The password needed to authenticate with the HTTP/HTTPS server. 
Firmware File Prefix 
Default is blank. If configured, GXW42XX will request firmware file with the prefix. This 
setting is useful for Internet Telephone Service Providers.  End users should keep it 
blank. 
Firmware File Postfix 
Default is blank. This setting is useful for Internet Telephone Service Providers. End 
users should keep it blank. 










