CP-8821 PROBLEMS

[zamoranoco]

HI Everybody,

I have a client who have more than 30 CP-8821. This client have a BE6K v.11.5. The phone, randomly, have different issues,

* The phone become disconnected from call manager

* The phone cuts the conversation in a middle of a conversation

Someone knows what could be. How to fix it?

Thanks

[Manish Gogna]

Hi,

Please check the following ( How to get your 8821/792x wireless phones performing reliably )

http://www.cisco.com/c/en/us/support/docs/collaboration-endpoints/unified-wireless-ip-phone-7925g/200032-How-to-get-your-792x-wireless-phones-per.html 

Seven basic guidelines to making VoWLAN work well

1. Have solid coverage in 5GHz - and lock your phones to 802.11a

2. Run current phone firmware

3. If using FlexConnect local switching, enable ARP caching

4. Use WPA2/AES EAP with Fast Secure Roaming - beware TKIP

5. Optimize channels, power, and data rates

6. Enable continuous scan mode (in CUCM)

7. Configure all QoS, and everything else, exactly as documented in the Deployment Guides

If the issue persists then you need to engage TAC with packet captures from Access Points / WLC for specific issues.

Manish

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[Mohammed al Baqari]

This is connectivity and can be design problem for VoIP over WiFi. Check list 

http://www.cisco.com/c/en/us/solutions/collateral/wireless/4400-series-wireless-lan-controllers/net_implementation_white_paper0900aecd804f1a46.html

[Leo Laohoo]

The phone become disconnected from call manager

When this happens, was the phone outside WiFi coverage (aka out of range or "OOR") or roaming from one AP to another? 

* The phone cuts the conversation in a middle of a conversation

During the phone conversation, was the phone roaming from one AP to another?  

How long was the cut to the conversation last?  45 seconds?