I have 2 Cisco 7920 phones and they both disconnect from wireless after
2-5 minutes. The only way to get it to connect again is turn phone on and off and then the cycle starts again. I have set the phones to factory default, reset the wep and ssid and rebooted the cisco aeronet AP's.Any idea.
Ensure that Temporal Key Integrity Protocol ( TKIP ) and Message Integrity Check ( MIC ) ( or Cisco KIP and Cisco MIC ) are not enabled for the voice VLAN Service Set Identifier ( SSID ) on the AP.
These features are not supported on the Cisco 7920 wireless IP phone.
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A common AP configuration error concerns Address Resolution Protocol ( ARP ) caching.
The phones expect this option to be enabled on the AP, but it is disabled by default on the AP.
For optimal performance, Cisco recommends enabling ARP caching on the AP, especially when using Wi-Fi devices capable of power management.
If you use Cisco Aironet cards, ARP caching is enabled by default, but you should ensure that this setting has not been changed by any central client management groups.
To configure ARP caching on the AP, select Services > ARP Caching. Issue the "dot11 arp-cache" command for arp-caching in global configuration mode.
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Hope this helps.
Brad Reese BradReese.Com - Cisco Network Engineer Directory
I followed those ideas and still have no luck. It just says callmanager down after using the phone for a few minutes. Only way to get it to connect is to power the phone off and then on.
You may wish to investigate Cisco Wireless IP Phone 7920 Release Notes:
Troubleshooting Cisco IP Telephony:
Sincerely,
Brad Reese Cisco Repair
Are your access points running IOS? If so, what version(s) are they running? Check also the firmware versions on the handsets (under "phone settings" in the menu). What we've found here is that 7920s with version 1.x firmware don't function correctly (similar symptoms to what you're reporting, or they never connect at all) with the newest versions of IOS for the access points we use. We have upgraded our handsets to firmware version 2.x (and some to 3.x for testing) and that resolved the problem for us.
I hope this helps ...
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