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
and Provisioning
Enables HT502 to download firmware or configuration file through either the TFTP,
HTTP or HTTPS server.
This is the IP address of the configured TFTP server. If selected and it is non-
zero or not blank, the HT502 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 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: Please do NOT interrupt the TFTP upgrade process (especially the power
supply) as this will damage the device. Depending on the local network, this
process can take up to 15 or 20 minutes.
The URL for the HTTP/HTTPS server used for firmware upgrade and configuration
via HTTP.
For example,
http://provisioning.mycompany.com:6688/Grandstream/1.0.0.67“:6688” is the
specific TCP port where the HTTP or HTTPS server is listening; it can be omitted
if using default port 80.
Note: If Auto Upgrade is set to No, HT502 will only do HTTP/HTTPS download
once at boot up.
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