48
Cannot Call Through Firewall
Please make sure that the firewall/NAT is configured properly to forward network traffic
to the correct ports on the telephone as indicated on the phone’s advanced-settings web
page (see the section, Configuration Web Site).
PC Cannot Access Network
If you connect your PC to the network through your telephone’s built-in hub (the port
labeled, PC, on the back of your telephone), and your telephone can access the
network but your PC cannot, you may have a defective network cable, or a loose
connection. All of these conditions are indicated by the LED next to the PC port being
solid off (not even blinking).
Common Cure For Electronic Equipment
As with all modern electronic equipment, if you are unable to solve your problem
otherwise, it may be useful to turn your telephone off by disconnecting the AC power
adapter from its port on your telephone, wait a few seconds, and then turn your
telephone back on by reconnecting the AC power adapter (or, if power-over Ethernet is
being used, unplugging the network cable and pluggin it back in).
Reinstating the Factory Default Settings
There are two ways to restore the factory default settings so that your telephone is in
a known state. One is to restore the telephone to the factory defaults through the
configuration menu (see the Navigation Map). Note that this also deletes all entries from
your phonebook. The other is to click on the button at the bottom of the configuration
web pages (see the section, Configuration Web Site). This restores the network,
telephone, server, and advanced settings to their factory defaults but not the
phonebook or password.
System Security
Your telephone has no encryption and minimal authentication capabilities. Therefore, be
aware that, although very unlikely, someone could intercept your conversation or, via
the web interface, guess your password and modify your configuration settings. To
minimize the chance of this happening, you should only connect to a trusted network
and, in particular, not the public Internet without a firewall providing some form of third-
party security.
Appendix A - Troubleshooting (cont.)
