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

We recently deployed 8821 phones in our environment. The past few weeks have been a challenge for us because of these issues. Most of our issues have subsided with the code update and configuration and code changes. 

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	Date	Comment
1.0	03-MAR-2017	Initial Public Release

Products Affected

Products Affected
8821 - CP-8821-K9-BUN
8821 - CP-8821-K9[=]

Problem Description

CP-8821 wireless phones deployed in Wireless LAN (WLAN) infrastructures do not work properly. The issues are caused by both 8821 phone and WLAN software bugs.

Background

CP-8821 new wireless phone adoption guidelines are not followed.

Problem Symptoms

Customers that deploy the 8821 in new and established WLAN infrastructures 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 will 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.

Unified Communications Manager
- Recommend Version 10.5(2), 11.0(1), 11.5(1), and later

Unified Survivable Remote Site Telephony (SRST)
- Recommend Version 11.0, 11.5, and later

Unified Communications Manager Express: 10.x, 11.x, and later
- Recommend Version 11.0, 11.5, and later

Hosted Collaboration Solution (HCS): 9.x, 10.x, 11.x, and later 
- Recommend Version 11.0, 11.5, and later

Wireless LAN Controller (WLC) and Access Points (APs) 
- Refer to the 8821 Wireless Deployment Guide for supported AP listings. Any AP model that is not listed in the deployment guide is not supported.

Cisco WLC and Cisco Lightweight APs
- Recommend at least Version 8.0.140.0, 8.2.141.0, or later 
- For the latest code recommendations for the AireOS based Cisco WLC, also refer to TAC Recommended AireOS Builds.

Cisco Meraki Access Points
MR18, MR24, MR26, MR32, MR34, MR42, MR52, and MR53 indoor AP platforms and the Cisco Meraki MR72 outdoor AP platform only. 

Cisco Autonomous APs
- Recommend Version 12.4(25d)JA2, 15.2(4)JB6, and 15.3(3)JD

8821 Wireless Phone
- Recommend latest Software Release 11.0(3) SR1 or later

Refer to the 8821 Wireless Deployment Guide for all settings, configurations, and troubleshooting recommendations.

These commands must be issued on all Cisco WLCs as a workaround for Cisco bug ID  CSCvd06463 - IOS AP doing AMSDU aggregation for voice traffic in queue 0 despite BA req declined by 8821:

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 

CDETS

To follow the bug ID link below and see detailed bug information, you must be a registered customer and you must be logged in.

CDETS	Description
CSCvd06463 (registered customers only)	IOS AP doing AMSDU aggregation for voice traffic in queue 0 despite BA req declined by 8821 See the Workaround/Solution section for the commands.
CSCvc52093 (registered customers only)	WLC send deauth 17 to phone in 4-way handshake
CSCvc65568 (registered customers only)	8821 fails 11r FT roam with "Invalid FTIE MIC"
CSCva66489 (registered customers only)	11r sess timeout after reassoc causing Deauth 17 mismatch FTIE
CSCvc80755 (registered customers only)	WLC Missed eap-reponse packet from phone
CSCvd12366 (registered customers only)	UI crash and drops call
CSCvd12387 (registered customers only)	Roam request not sent OTA
CSCvd12651 (registered customers only)	8821 shows higher RSSI than it should for afar AP
CSCvd07716 (registered customers only)	Network Busy due to no response from firmware for ADDTS request

Compliance Hold

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.