Question about Cisco 7940 IP Phone
If there are lines through your line appearances than your phone is likely not properly registered with your Callmanager or SIP registrar, you need to configure your phone properly so it registers and associates with an extension on your PBX or hosted service.
<a rel='nofollow' href="http://www.ciscopowercube.com">Cisco CP-PWR-CUBE3</a>
Posted on Dec 13, 2012
SOURCE: Power Outage
Verify that your VOIP phone is still plugged into a POE (Power over ethernet) port. If it is, verify the integrity of your network line. If for any reason your line is damaged (like dropping some gear on it, shutting it in a connex door, leg of your cot pinching it, or even your IMO got confused and snipped the line. Definitely check layer 1 which is your physical line, and the switch it plugs into. Check your ends also, if you have crappy crimp jobs on your RJ45 ends you might be in trouble. See if you cant score some CAT6 cable from the commo guys. That'll help.
Hope your phone is back up soon. Good luck, be safe, the Military is a small world and I might see you around. ;-)
Posted on Jun 11, 2008
This is happening because your "Self-Cleaning" hookswitch is going bad. Since it's a carbon contact design, this will happen more and more frequently. I recommend sending your Cisco IP phones to IdacomUSA for repair and refurbishment. If you are the DIY type of person, we are also selling the pad and assembly for the Cisco hookswitch at $15 each (w/minimum order)
Posted on Jun 17, 2009
Change out your cable from the wall drop to the phone. A Cisco phone is capable of receiving inline power (Power Over Ethernet) via the blue and brown pairs of the cable. It sounds like you may have a cable with a short in either the brown or blue, or both pairs, shorting out the power when it is connected via ethernet.
If you can, have your IT Tech check the cable, and the line through the wall to the switch.
Posted on May 26, 2010
Connecting a hub or switch to the "PC" port on the back of the phone is not a recommended best practice by Cisco as the IP phone does not support spanning tree protocol.
Posted on Jan 11, 2011
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