I've tried taking the phone itself to different locations on our network, to see if at a different location it would ring, but it did not. The phones themselves are designated certain extensions, so I didn't really think that would work.
Then we tried forwarding the calls to another number to see if it was just the actual ringer not working, but that's not the case either. It doesn't ring at all through the earpiece, but goes straight to voicemail.
Also, simply adjusting the volume on the phone, or changing the ringer, we've found that the ringer itself still does work. Just not for incoming calls. It seems the phone itself is not recieving the calls, because the screen as well does not show the incoming call, but it does however indicate when there is a new voice message, and then works fine when we check them.
I'm afraid I'm not very technical, and this is about as far as my experiments have gone.
Network Address Translation (NAT) Settings for Lines on PAP2T and SPA3102 Phone Adapters
The objective of this document is to configure Network Address Translation (NAT) settings for the lines of communication on the PAP2T ...
Speed Dial Settings on SPA100 Series
Speed Dial Buttons are often used to make the process of calling regularly used contacts quicker and with one button. This option is used in place of dialing the entire phone number in. ...
Firmware Upgrade on SPA112 and SPA122
To upgrade the firmware a specific file must be downloaded from the Internet and uploaded to the device. Upgrading your devices can be very useful. Firmware upgrades can fix software bu...