Audio Quality; External Device Use - Cisco 7925G Installing Manual

Headset Usage
headset automatically reconnects. For certain phone types that operate in power-save modes, the user may
have to "wake up" the headset by tapping on its operational button to initiate the reconnect.
Users should read the headset user guide for more information about pairing and connecting the headsets.
Note

Audio Quality

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 is subjective and Cisco cannot guarantee the performance
of any headsets, but some of the headsets on the sites listed below have been reported to perform well on
Cisco Unified IP Phones.
Nevertheless, it is ultimately the customer's responsibility to test this equipment in their own environment to
determine suitable performance.
For information about wired and Bluetooth wireless headsets for your phone, see the Cisco Unified Wireless
IP Phone 7925G, 7925G-EX, and 7926G Accessory Guide and these web sites:
• http://www.plantronics.com
•
http://www.jabra.com
• http://www.jawbone.com

External Device Use

Cisco recommends the use of good quality external devices, such as speakers, microphones, and headsets that
are shielded (screened) against unwanted radio frequency (RF) and audio frequency (AF) signals.
Depending on the quality of these devices and their proximity to other devices, such as mobile phones or
two-way radios, some audio noise may still occur. In these cases, Cisco recommends that you take one or
more of the following actions:
• Move the external device away from the source of the RF or AF signals.
• Route the external device cables away from the source of the RF or AF signals.
• Use shielded cables for the external device, or use cables with a better shield and connector.
• 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 the system because Cisco has no control over the quality of external
devices, cables, and connectors. The system performs adequately when suitable devices are attached with
good quality cables and connectors.
Caution In European Union countries, use only external headsets that are fully compliant with the EMC Directive
[89/336/EC].
Cisco Unified Wireless IP Phone 7925G, 7925G-EX, and 7926G Administration Guide
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Cisco Unified Wireless IP Phone 7925G, 7925G-EX, and 7926G Setup