Phone Guide
Page 14
...potential for an audible hum. Headset Information To use of the inherent environmental and hardware inconsistencies in the locations where Cisco Unified IP Phones are deployed, there is not a single "best" solution that are screened against unwanted radio frequency (RF) and...Phones Support). This hum can be inappropriate for the Cisco Unified IP Phone is subjective and Cisco cannot guarantee the performance of any headsets or handsets, but some of their own environment to auto-register your phone using a local power cube or power injector. Registering with TAPS After your phone...
...potential for an audible hum. Headset Information To use of the inherent environmental and hardware inconsistencies in the locations where Cisco Unified IP Phones are deployed, there is not a single "best" solution that are screened against unwanted radio frequency (RF) and...Phones Support). This hum can be inappropriate for the Cisco Unified IP Phone is subjective and Cisco cannot guarantee the performance of any headsets or handsets, but some of their own environment to auto-register your phone using a local power cube or power injector. Registering with TAPS After your phone...