Cisco Systems 7821 ユーザーズマニュアル
In European Union countries, use only external speakers, microphones, and headsets that are fully compliant
with the EMC Directive [89/336/EC].
with the EMC Directive [89/336/EC].
Caution
Cisco IP Phone 7821, 7841, and 7861 Administration Guide for Cisco Unified Communications Manager 10.0 (SIP)
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External Devices