Field Notice: FN - 64274 - CP-8821 Fails in Wireless LAN Infrastructures - Software Upgrade Recommended

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Updated:March 22, 2018
Document ID:FN64274

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Notice

THIS FIELD NOTICE IS PROVIDED ON AN "AS IS" BASIS AND DOES NOT IMPLY ANY KIND OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTY OF MERCHANTABILITY. YOUR USE OF THE INFORMATION ON THE FIELD NOTICE OR MATERIALS LINKED FROM THE FIELD NOTICE IS AT YOUR OWN RISK. CISCO RESERVES THE RIGHT TO CHANGE OR UPDATE THIS FIELD NOTICE AT ANY TIME.

Revision History

Revision Publish Date Comments
1.0
28-Jun-17
Initial Release
1.5
21-Nov-17
Migration to new field notice system
1.6
22-Mar-18
Updating review list.

Products Affected

Affected Product ID Comments
CP-8821-K9
CP-8821-K9-BUN
CP-8821-K9=

Defect Information

Defect ID Headline
CSCvc52093 WLC send deauth 17 to phone in 4-way handshake
CSCvc65568 8821 fails 11r FT roam with "Invalid FTIE MIC"
CSCva66489 11r sess timeout after reassoc causing Deauth 17 mismatch FTIE
CSCvd06463 AMSDU packets Tx cause 5 sec gap of packet Tx to Cisco Wireless IP Phone 8821 from Cisco Wave1 APs
CSCus83638 5-GHz radio on Cisco AP beaconing but not accepting client associations
CSCvb93189 AP drops Retransmitted M3 from WLC
CSCvb97383 Cisco WLC deauthenticating roaming client with idle timeout
CSCvc28168 WLC set ZERO 802.11e QoS UP for part of the downstream voice packets and APs trust it
CSCvc99928 AP changing UP marking from 6 to 0 for downlink traffic after 802.11r roam with 8821 phones
CSCve20123 Corrupt voice packets are observed when a client with an active call does an inter-AP roam
CSCve40462 Inspite of ACM being globally enabled, the ACM is disabled in the probe response from Cisco 1832 AP

Problem Description

CP-8821 wireless phones experience issues when deployed in some Wireless LAN (WLAN) environments.

Background

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.

Problem Symptom

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

Workaround/Solution

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 8.0.150.0, 8.2.166.0, and 8.3.140.0 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

Additional Information

In order to ensure successful deployment of the 8821, these actions must be taken before Sales Orders are released:

  1. Perform a Wireless Network Site Survey.
  2. If a partner is responsible for the installation, verify that the partner has certification for Voice over WLAN.
  3. 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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