First Published: November 19, 2025

Release Notes

Use these release notes with the Cisco IP Phone 8800 Series Multiplatform Phones running SIP Firmware Release 12.0(7)SR3.

  • Cisco IP Phone 8811 Multiplatform Phones

  • Cisco IP Phone 8841 Multiplatform Phones

  • Cisco IP Phone 8851 Multiplatform Phones

  • Cisco IP Phone 8861 Multiplatform Phones

The following table describes the individual phone requirements.

Phone

Support Requirements

Cisco IP Phone 8800 Series Multiplatform Phones

Cisco BroadWorks RI

Asterisk 20

New and Changed Features

Adjust font size

With the Firmware Release 12.0(7)SR3, the Font Size feature is available on the Cisco IP Phone 8800 Series Multiplatform Phones. For a better visual experience, this feature enables you to adjust the size of the fonts that are displayed on the phone screen. Note that the customization of the font size does not change few of the texts, such as the texts in a prompt window.

Where to Find More Information

  • Cisco IP Phone 8800 Series Multiplatform Phones User Guide

  • Accessibility Features for the Cisco IP Phone 8800 Series Multiplatform Phones

Enhance SSRC Reset for the new RTP and SRTP sessions

With Firmware Release 12.0(7)SR3, a new configuration SSRC Reset on Tx RE-INVITE is added to control whether to reset the RTP Tx SSRC when a phone sends an outgoing RE-INVITE. Hence, you can avoid the one-way audio issue on a long duration call followed by a hold-resume action in certain Webex Calling environments where the SRTP is end-to-end encrypted.

Meanwhile, the legacy configuration of SSRC Reset on RE-INVITE is now renamed to SSRC Reset on Rx RE-INVITE to avoid confusion. The corresponding XML parameter in the phone configuration file (cfg.xml) is updated to <SSRC_Reset_on_Rx_RE-INVITE>. This parameter now controls whether to reset the RTP Tx SSRC on any incoming RE-INVITE.

Where to Find More Information

  • Cisco IP Conference Phone Multiplatform Phone Administration Guide

  • Cisco IP Desk Phone with Multiplatform Firmware (MPP) Administration Guide

  • XML Reference Guide for Cisco IP Phone Multiplatform Phones

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/286311392

On the Software Download web page that is displayed, ensure that IP Phone 8800 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.

8811, 8841, 8851, and 8861: cmterm-88xx.12-0-7MPP0301-92_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

      Example:

      8811, 8841, 8851, and 8861:

      http://10.73.10.223/firmware/sip88xx.12-0-7MPP0301-92.loads

      https://server.domain.com/firmware/sip88xx.12-0-7MPP0301-92.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

    Example:

    8811, 8841, 8851, and 8861:

    http://10.74.10.225/admin/upgrade?http://10.73.10.223/firmware/sip88xx.12-0-7MPP0301-92.loads

    https://10.74.10.225/admin/upgrade?https://server.domain.com/firmware/sip88xx.12-0-7MPP0301-92.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 8800 Series Multiplatform Phones that use Firmware Release 12.0(7)SR3.

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.

  • CSCwf10956—Macro $SERVIP is not expanded in Log Request Msg in syslog.

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

  • CSCwe55809—Personal contact calls play the distinctive ring while there's an active call on 8800 phones.

Resolved Caveats

The following list contains the severity 1, 2, and 3 defects that are resolved for the Cisco IP Phone 8800 Series Multiplatform Phones that use Firmware Release 12.0(7)SR3.

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 the View Caveats.

  • CSCwr83928—Unintended direct transfer to held calls occurs after a user cancels a transfer.