Cisco Unified IP Phone 7900 Series

Field Notice: FN - 62072 - CP-7970G or CP-7971G-GE May Lose Power When Using Inline Power After Upgrading to 6.0(3)

Revised September 06, 2005

August 01, 2005

Products Affected



7970 - CP-7970G

Loaded with 6.0(3)

7970 - CP-7971G-GE

Loaded with 6.0(3)

Problem Description

After upgrading to 6.0(3), the phone will boot and after 15 - 30 seconds and the switch will drop power to the port. The phone will continually boot up, then lose power.

Note: This problem may appear regardless of whether the CP-7970G or CP-7971G-GE is using proprietary Power Over Ethernet or standards-based 802.3af.


The CP-7970G or CP-7971G-GE must be running 6.0(3) and running on inline power when connected to various combinations of OS, platforms and blades. The IP Phone with 6.0(3) loaded and connected to a switch does not advertise its power consumption values in Cisco Discovery Protocol (CDP).

If your CP-7970G or CP-7971G-GE is not exhibiting power-up problems, there is no need to implement the workarounds noted below.

Problem Symptoms

The CP-7970G or CP-7971G-GE will be stuck in power-on, power-off loop every 15-30 seconds. The phone will not be usable when this state is reached.



  1. Setting static power to 7 watts works on some combinations of OS and platforms. Set power inline mod/port static 7000. Use the command inlinepower static 7000 to set power.

  2. If option 1 is not available, the other workaround is to power the phones with wall power using the CP-PWR-CUBE-2 or CP-PWR-CUBE-3.

In order to obtain a CP-PWR-CUBE-2 or CP-PWR-CUBE-3, contact your service partner or Cisco TAC and request a return materials authorization (RMA). Service Logistics has good inventory at this time. The standard RMA process and delivery times are in effect. Request on each CP-PWR-CUBE-2 or CP-PWR-CUBE-3 for each CP-7970G or CP-7971G-GE that is affected.


Upgrade phone software to 6.0(3)SR1. In order to accomplish this, you may have to temporarily attach a power cube model CP-PWR-CUBE-2 or CP-PWR-CUBE-3 to achieve online state.


To follow the bug ID link below and see detailed bug information, you must be a registered user and you must be logged in.



CSCsa88563 (registered customers only)

7970 doesn't advt power consumption with 6-0-3 load

CSCsa88581 (registered customers only)

7970 won't boot w/ inline power

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:

Receive Email Notification For New Field Notices

Product Alert Tool - Set up a profile to receive email updates about reliability, safety, network security, and end-of-sale issues for the Cisco products you specify.