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How to set a Cisco IP phone to factory default
Reset configuration of Cisco IP Phone (7910, 1911, 7940, 7941, 7960, 7961)
To set the Cisco IP phone to factory default completes the following steps: should be completed:
For 7940, 7941, 7960, 7961 phones:
1. Power up the phone (unplug power cable and plug in again and hold the # key.
2. Release # when lights start flashing.
3. Press 123456789*0#.
4. Press 1 to keep network configuration or 2 to lose the network configuration.
For 7906G and 7911G phones:
1. Power up the phone (unplug power cable and plug in again and hold the # key.
2. Release # when MWI starts flashing.
3. Press 3491672850*#.
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.
Make sure you have the phone configured as the correct device type in callmanager. Also, try and turn on auto registration in Callmanager as this will allow everything to register. Then go back and put the correct configuration the phone.
I would check your duplex settings. Often, if you hard code the duplex settings or have a mis-match; one end may not talk properly. Also, have you tested the wiring? Do you know the ethernet is okay for sure? TechRx, Inc. - techrxgb.com
See Cisco's user guide regarding template modification and customization at http://www.ciscosystems.am/en/US/docs/voice_ip_comm/cuipph/7960g_7940g/7_0/sip/english/administration/guide/7960usrS.pdf
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)
Unfortunately this is a very common problem with Cisco's IP Phones. It can be caused by either a faulty hookswitch or a damaged jack. Both of these problems can be remedied by contacting IdacomUSA.
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