Field Notice: FN - 63766 - Update - 7900 Series - Intermittent Bug May Impact Interoperability with Cisco Emergency Responder (CER) - BIOS/Firmware Upgrade Recommended

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	Publish Date	Comments
1.0	27-Jun-14	Initial Release
10.0	25-Oct-17	Migration to new field notice system

Products Affected

Affected Product ID	Comments
CP-7906G
CP-7911G
CP-7931G
CP-7941G
CP-7941G-GE
CP-7942G
CP-7945G
CP-7961G
CP-7961G-GE
CP-7962G
CP-7965G
CP-7970G
CP-7971G-GE
CP-7975G

Defect Information

Defect ID	Headline
CSCuj11814	796x/4x phones not passing correct Device IDs to switch port via CDP

Problem Description

Some models of the 7900 Series phones that use firmware Version 9.3.1SR2.1 and earlier releases might send incomplete Device IDs to their connected Cisco switches.

Cisco advises all customers to upgrade their 7900 Series phones to firmware Version 9.3.1SR3 or later in order to obtain this fix and other important firmware upgrades.

Impacted Device Type	Impacted Load Name	Impacted Version
7911_7906-sccp	7911_7906-sccp.9-3-1SR2-	9.3(1SR2.1)
7911_7906-sip	7911_7906-sip.9-3-1SR2-1	9.3(1SR2.1)
7931-sccp	7931-sccp.9-3-1SR2-1	9.3(1SR2.1)
7931-sip	7931-sip.9-3-1SR2-1	9.3(1SR2.1)
7941_7961-sccp	7941_7961-sccp.9-3-1SR2-1	9.3(1SR2.1)
7941_7961-sip	7941_7961-sip.9-3-1SR2-1	9.3(1SR2.1)
7942_7962-sccp	7942_7962-sccp.9-3-1SR2-1	9.3(1SR2.1)
7942_7962-sip	7942_7962-sip.9-3-1SR2-1	9.3(1SR2.1)
7945_7965-sccp	7945_7965-sccp.9-3-1SR2-1	9.3(1SR2.1)
7945_7965-sip	7945_7965-sip.9-3-1SR2-1	9.3(1SR2.1)
7970_7971-sccp	7970_7971-sccp.9-3-1SR2-1	9.3(1SR2.1)
7970_7971-sip	7970_7971-sip.9-3-1SR2-1	9.3(1SR2.1)
7975-sccp	7975-sccp.9-3-1SR2-1	9.3(1SR2.1)
7975-sip	7975-sip.9-3-1SR2-1	9.3(1SR2.1)

Background

A defect found in the firmware noted in the Products Affected section might cause some models of the 7900 Series phones to send incomplete Device IDs to their connected Cisco switches. As a result, Cisco Emergency Responder (CER) might be unable to locate some phones that run this firmware. Emergency (911) calls might be associated with incorrect locations and might be sent to the wrong Public Safety Answering Point (PSAP).

After further investigation, Cisco believes that the defect might exist in previous releases of the firmware for the affected phones. Therefore, Cisco encourages customers to upgrade their phones to the latest firmware.

Problem Symptom

Some models for the 7900 series phones will not send the correct Device ID to the switch via Cisco Discovery Protocol (CDP). For example, if a Device ID is configured as SEP012345678901, the phone will send ?SEP0? to the Cisco switch. This affects 7900s running 9-3-1-SR2.1.

Workaround/Solution

The workaround is to hard reset the phone. For example, issue a 'shutdown' followed by 'no shutdown' on a Power over Ethernet (PoE) switchport.

Upgrade affected phones to the firmware version 9.3.1SR3 or later.

For More Information

If you require further assistance, or if you have any further questions regarding this field notice, please contact the Cisco Systems Technical Assistance Center (TAC) by one of the following methods:

• Open a service request on Cisco.com
• By email
• By telephone

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