Cisco 7940 Phone Guide - Page 14

Audio Quality Subjective to the User - phone

Page 14 highlights

Note In some cases, hum may be reduced or eliminated by using a local power cube or power injector. These environmental and hardware inconsistencies in the locations where Cisco Unified IP Phones are deployed means that there is not a single headset solution that is optimal for all environments. Cisco recommends that customers test headsets in their intended environment to determine performance before making a purchasing decision and deploying en masse. Audio Quality Subjective to the User Beyond the physical, mechanical and technical performance, the audio portion of a headset must sound good to you (the user) and to the party on the far end. Sound quality is subjective and Cisco cannot guarantee the performance of any headsets. However, a variety of headsets from leading headset manufacturers have been reported to perform well with Cisco Unified IP Phones. See manufacturer's sites for details. 6 OL-15496-01

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6
OL-15496-01
Note
In some cases, hum may be reduced or eliminated by using a local power cube or power
injector.
These environmental and hardware inconsistencies in the locations where Cisco Unified IP Phones are
deployed means that there is not a single headset solution that is optimal for all environments.
Cisco recommends that customers test headsets in their intended environment to determine
performance before making a purchasing decision and deploying en masse.
Audio Quality Subjective to the User
Beyond the physical, mechanical and technical performance, the audio portion of a headset must
sound good to you (the user) and to the party on the far end. Sound quality is subjective and Cisco
cannot guarantee the performance of any headsets. However, a variety of headsets from leading
headset manufacturers have been reported to perform well with Cisco Unified IP Phones. See
manufacturer’s sites for details.