Table of Contents
Note Firmware release 8.1(4a) is designed and tested to interoperate with Cisco call control, most notably Unified CM releases 7.1, 7.0, 6.1, 6.0, and 5.1. Although SIP firmware is IETF RFC 3261 compliant, it is not supported by Cisco TAC or Engineering for use with non-Cisco call control systems.
Refer to the Cisco Unified Communications Manager Business Edition Documentation Guide and other publications that are specific to your Cisco Unified Communications Manager release. Navigate from the following URL:
Firmware release 8.1(4a) introduces the Daylight Savings Time (DST) Calculation Algorithm to provide a mechanism to handle time zone updates on the Unified CM server without requiring an update for the phone firmware.
When countries change or shift their time zone for DST, it requires additional resources to track and resolve these changes. Defects are opened to track and resolve each DST change; the total number of outstanding defects can increase significantly during certain times of the year when the time zone changes occur very close together.
This feature allows the IP Phone firmware update for each DST change to be completed using a cop file. This cop file contains the required updates for the Unified CM without requiring an a new load for the IP Phone or the Unified CM server.
The authentication name is only used if the Enable Digest Authentication checkbox is checked in the Phone Security Profile Configuration window. The authentication name is derived from the User ID of the end user assigned to the phone.
Before using the Cisco Unified SIP Phone 3951 and 3911 with Cisco Unified Communications Manager, you must install the latest firmware on all Cisco Unified Communications Manager servers in the cluster.
Step 9 Click the + next to the firmware file name in the Download Cart section to access additional information about this file.The hyperlink for the Readme file is in the Additional Information section, which contains installation instructions for the corresponding firmware.
In order to support dual tone multi-frequency (DTMF), Cisco Unified SIP Phone 3951 and 3911 require the use of gateways with media termination point (MTP) transcoders that support RFC 2833, such as the Cisco 3825 Router. You can configure the system to support DTMF by either configuring the MTP on a transcoding device that supports RFC 2833 or by checking the Require DTMF Reception check box for each registered Cisco Unified SIP Phone 3951 and 3911 in Cisco Unified Communications Manager Administration, Phone Configuration window.
Anything that degrades network performance can affect Cisco IP Phone voice and video quality, 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
Step 1 To access the Bug Toolkit, go to http://tools.cisco.com/Support/BugToolKit/action.do?hdnAction=searchBugs.
Table 1 lists Severity 1, 2 and 3 defects that are resolved for the Cisco Unified SIP Phone 3951 and 3911 firmware release 8.1(4a).
For more information about an individual defect, you can access the online record for the defect by clicking the Identifier or going to the URL shown. You must be a registered Cisco.com user to access this online information.
Because defect status continually changes, be aware that Table 1 reflects a snapshot of the defects that were resolved at the time this report was compiled. For an updated view of resolved defects, access Bug Toolkit as described in the Using Bug Toolkit.
- Cisco Unified SIP Phone 3951 Administration Guide for Cisco Unified Communications Manager 6.0 and 5.1
- Cisco Unified SIP Phone 3951 Phone Guide for Cisco Unified Communications Manager 6.0 and 5.1
- Cisco Unified SIP Phone 3911 Administration Guide for Cisco Unified Communications Manager 6.0 and 5.1
- Cisco Unified SIP Phone 3911 Phone Guide for Cisco Unified Communications Manager 6.0 and 5.1
In the “Understanding Buttons and Hardware” section of the Cisco Unified SIP Phone 3951 Phone Guide for Cisco Unified Communications Manager 6.0 and 5.1 and Cisco Unified SIP Phone 3911 Phone Guide for Cisco Unified Communications Manager 6.0 and 5.1, there is an erroneous reference to the “Using the Handset and Speakerphone” section for the Mute Button. The correct reference is the “Using Mute” section.
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Any Internet Protocol (IP) addresses used in this document are not intended to be actual addresses. Any examples, command display output, and figures included in the document are shown for illustrative purposes only. Any use of actual IP addresses in illustrative content is unintentional and coincidental.