Cisco 7800 Series

•
Shorten the length of the external device cable.
•
Apply ferrites or other such devices on the cables for the external device.
Cisco cannot guarantee the performance of external devices, cables, and connectors.
In European Union countries, use only external speakers, microphones, and headsets that are fully compliant
with the EMC Directive [89/336/EC].
Caution
Cisco IP Phone 7800 Series Administration Guide for Cisco Unified Communications Manager
15
External Devices