First Published: February 26, 2021

Release Notes

This release contains only internal changes to optimize manufacturing process.

Use these release notes with the Cisco IP Phone 6821 Multiplatform Phones running SIP Firmware Release 11.3(1)SR4.

The following table describes the individual phone requirements.

Phone

Support Requirements

Cisco IP Phone 6821 Multiplatform Phones

Cisco BroadWorks 23.0

MetaSphere CFS version 9.5

Asterisk 11.0

New and Changed Features

This release is a maintenance release and doesn't contain any new or enhanced features.

Upgrade the Firmware

You can upgrade the phone firmware with TFTP, HTTP, or HTTPS. After the upgrade completes, the phone reboots automatically.

Procedure

Step 1

Click this link:

https://software.cisco.com/download/home/286318380

On the Software Download web page that is displayed, ensure that IP Phone 6800 Series with Multiplatform Firmware is selected in the middle pane.

Step 2

Select your phone model in the right pane.
Step 3

On the next page that is displayed, select Multiplatform Firmware.

Step 4

Under All Release, select the MPPv11 folder, then select the 11.3.1 MSR4-1 folder.

Step 5

(Optional) Place your mouse pointer on the file name to see the file details and checksum values.
Step 6

Download the file cmterm-6821.11-3-1MSR4-1_REL.zip.

Step 7

Click Accept License Agreement.

Step 8

Unzip the file and place the files in the appropriate location on your upgrade server.

The appropriate location is the TFTP, HTTP, or HTTPS download folder, depending on the protocol that you want to use for the upgrade.

Step 9

Upgrade the phone firmware with one of these methods.

  • Upgrade the phone firmware from the phone administration web page:

    1. On the phone administration web page, go to Admin Login > Advanced, Voice > Provisioning > Firmware Upgrade.

    2. In the Upgrade Rule field, enter the load file URL as described below.

      Load file URL format:

      <upgrade protocol>://<upgrade server ip address>[:<port>]>/<path>/<file name>.loads

      Examples:

      http://10.73.10.223/firmware/sip6821.11-3-1MSR4-1.loads

      https://server.domain.com/firmware/sip6821.11-3-1MSR4-1.loads

    3. Click Submit All Changes.

  • Upgrade the phone firmware directly from your web browser:

    In the address bar of your web browser, enter the phone upgrade URL as described below.

    Phone upgrade URL format:

    <phone protocol>://<phone ip address[:port]>/admin/upgrade?<load file URL>

    Load file URL format:

    <upgrade protocol>://<upgrade server ip address>[:<port>]>/<path>/<file name>.loads

    Examples:

    https://10.74.10.225/admin/upgrade?http://10.73.10.223/firmware/sip6821.11-3-1MSR4-1.loads
    https://10.74.10.225/admin/upgrade?https://server.domain.com/firmware/sip6821.11-3-1MSR4-1.loads
Note 

Specify the <file name>.loads file in the URL. The <file name>.zip file contains other files.

Limitations and Restrictions

Phone Behavior During Times of Network Congestion

Anything that degrades network performance can affect phone audio and, in some cases, can cause a call to drop. Sources of network degradation can include, but are not limited to, the following activities:

  • Administrative tasks, such as an internal port scan or security scan

  • Attacks that occur on your network, such as a Denial of Service attack

View Caveats

This release doesn't contain any open or resolved caveats.