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|Affected Product ID
||WLC send deauth 17 to phone in 4-way handshake|
||8821 fails 11r FT roam with "Invalid FTIE MIC"|
||11r sess timeout after reassoc causing Deauth 17 mismatch FTIE|
||AMSDU packets Tx cause 5 sec gap of packet Tx to Cisco Wireless IP Phone 8821 from Cisco Wave1 APs|
||5-GHz radio on Cisco AP beaconing but not accepting client associations|
||AP drops Retransmitted M3 from WLC|
||Cisco WLC deauthenticating roaming client with idle timeout|
||WLC set ZERO 802.11e QoS UP for part of the downstream voice packets and APs trust it|
||AP changing UP marking from 6 to 0 for downlink traffic after 802.11r roam with 8821 phones|
||Corrupt voice packets are observed when a client with an active call does an inter-AP roam|
||Inspite of ACM being globally enabled, the ACM is disabled in the probe response from Cisco 1832 AP|
CP-8821 wireless phones experience issues when deployed in some Wireless LAN (WLAN) environments.
CP-8821 new wireless phone adoption guidelines are not followed and other related deployment issues.
Previous software releases have resolved all known showstoppers and quality issues related to roaming, connectivity, audio-voice quality, phone freeze, and miscellaneous issues. The Out of Range (OOR) experience has been enhanced and customer reported miscellaneous non-critical defects have been resolved. Finally, the latest 8821 firmware release 11.0(3)SR6 further enhanced the OOR experience and improved scanning algorithm.
It is recommended that customers adopt 11.0(3) SR6 in order to avoid past known issues.
Customers that deploy the 8821 in new and established WLAN environments might see these issues:
- Poor voice quality
- Audio gaps
- Lost registration
- Problems with roaming
- User interface hangs/restarts
Software updates and configuration modifications are required for Unified Communications Manager, the Cisco WLAN Controller, and the 8821 Wireless Phone. While these modifications do not resolve all known issues, they do address the most critical problems.
It is HIGHLY recommended that the customer becomes familiar with instructions and content of the 8821 Wireless Deployment Guide found on Cisco.com.
8821 Wireless Phone
Cisco Call Control
Refer to the 8821 Wireless Deployment Guide for supported platforms and software versions.
Cisco Wireless LAN Controller (WLC) and Access Points (APs)
Refer to the 8821 Wireless Deployment Guide for supported AP models and software versions. Any AP model that is not listed in the deployment guide is not supported.
For the latest code recommendations for the AireOS based Cisco WLC, also refer to TAC Recommended AireOS Builds.
Cisco bug ID CSCvd06463 - AMSDU packets Tx cause 5 sec gap of packet Tx to Cisco Wireless IP Phone 8821 from Cisco Wave1 APs.
If versions earlier than 184.108.40.206, 220.127.116.11, and 18.104.22.168 are utiilized, these commands must be issued on all Cisco WLCs as a workaround for Cisco bug ID CSCvd06463 - AMSDU packets Tx cause 5 sec gap of packet Tx to Cisco Wireless IP Phone 8821 from Cisco Wave1 APs.
These are the commands for 5 GHz, if Cisco 8821 on 5 GHz is used:
- config 802.11a disable network
- config 802.11a 11nSupport a-msdu tx priority all disable
- config 802.11a enable network
These are the commands for 2.4 GHz, if Cisco 8821 on 2.4 GHz is used:
- config 802.11b disable network
- config 802.11b 11nSupport a-msdu tx priority all disable
- config 802.11b enable network
In order to ensure successful deployment of the 8821, these actions must be taken before Sales Orders are released:
- Perform a Wireless Network Site Survey.
- If a partner is responsible for the installation, verify that the partner has certification for Voice over WLAN.
- Confirm that the wireless infrastructure (WLC, APs, and so on) runs on the latest released version of the firmware.
For More Information
If you require further assistance, or if you have any further questions regarding this field notice, please contact the Cisco Systems Technical Assistance Center (TAC) by one of the following methods:
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