First Published: February 10, 2026

Release Notes

Use these release notes with the following Cisco IP Phone 6800 Series Multiplatform Phones running SIP Firmware Release 12.0(7)SR4.

  • Cisco IP Phone 6821 Multiplatform Phones

  • Cisco IP Phone 6841 Multiplatform Phones

  • Cisco IP Phone 6851 Multiplatform Phones

  • Cisco IP Phone 6861 Multiplatform Phones

  • Cisco IP Phone 6871 Multiplatform Phones


Note

This document doesn't include the DECT phones.

The following table describes the individual phone requirements.

Phone

Support Servers

Cisco IP Phone 6800 Series Multiplatform Phones

Cisco BroadWorks RI

Asterisk 20

New and Changed Features

Report Webex Connection Status

With Firmware Release 12.0(7)SR4, devices report the Webex Connection status in SIP Registration. This enables administrators to view the Webex Connection status in Control Hub.

Speed dial settings shouldn't get wiped out after upgrading the firmware

In this release, we fixed an issue where the speed dial settings could be wiped out after upgrading the phone to the latest firmware.

Upgrade 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

On the next page that is displayed, select 12.0.7 in the All Releases > MPPv12 folder.

Step 5

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

Step 6

Download the corresponding file.

  • 6821: cmterm-6821.12-0-7MPP0401-111_REL.zip

  • Other phones in 6800 series: cmterm-68xx.12-0-7MPP0401-111_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:

      • 6821:

        http://10.73.10.223/firmware/sip6821.12-0-7MPP0401-111.loads

        https://server.domain.com/firmware/sip6821.12-0-7MPP0401-111.loads

      • Other phones in 6800 series:

        http://10.73.10.223/firmware/sip68xx.12-0-7MPP0401-111.loads

        https://server.domain.com/firmware/sip68xx.12-0-7MPP0401-111.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:

    • 6821:

      http://10.74.10.225/admin/upgrade?http://10.73.10.223/firmware/sip6821.12-0-7MPP0401-111.loads

      https://10.74.10.225/admin/upgrade?https://server.domain.com/firmware/sip6821.12-0-7MPP0401-111.loads

    • Other phones in 6800 series:

      http://10.74.10.225/admin/upgrade?http://10.73.10.223/firmware/sip68xx.12-0-7MPP0401-111.loads

      https://10.74.10.225/admin/upgrade?https://server.domain.com/firmware/sip68xx.12-0-7MPP0401-111.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

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

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

Caveats

View Caveats

You can search for caveats (bugs) with the Cisco Bug Search tool.

Known caveats are graded according to severity level, and are either open or resolved.

Before you begin

You have your Cisco.com user ID and password.

Procedure

Step 1

Click one of the following links:

Step 2

When prompted, log in with your Cisco.com user ID and password.

Step 3

(Optional) For information about a specific caveat, enter the bug ID number (CSCxxnnnnn) in the Search for field, and press Enter.

Open Caveats

The following list contains the severity 1, 2, and 3 defects that are open for the Cisco IP Phone 6800 Series Multiplatform Phones that use Firmware Release 12.0(7)SR4.

For more information about an individual defect, you can access the online history for the defect by accessing the Bug Search tool and entering the Identifier (CSCxxnnnnn). You must be a registered Cisco.com user to access this defect information.

Because the defect status continually changes, the list reflects a snapshot of the defects that were resolved at the time this report was compiled. For an updated view of the resolved defects or to view specific bugs, access the Bug Search Toolkit as described in View Caveats.

  • CSCwb46008—Many PRTs with logs missing for around 5 seconds.

Resolved Caveats

The following list contains the severity 1, 2, and 3 defects that are resolved for the Cisco IP Phone 6800 Series Multiplatform Phones that use Firmware Release 12.0(7)SR4.

For more information about an individual defect, you can access the online history for the defect by accessing the Bug Search tool and entering the Identifier (CSCxxnnnnn). You must be a registered Cisco.com user to access this defect information.

Because the defect status continually changes, the list reflects a snapshot of the defects that were resolved at the time this report was compiled. For an updated view of the resolved defects or to view specific bugs, access the Bug Search Toolkit as described in View Caveats.

  • CSCws80398—CP-8811-3PCC fails to register to SGW.

  • CSCws60493—There are no A record looking up for websocket FQDN.