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Chapter 3 Setting Up the Cisco IP Phone
Installing the Cisco IP Phone
3-8
Cisco IP Phone 7970 Administration Guide for Cisco CallManager 3.3
OL-4314-01
Using External Devices with Your Cisco IP Phone
The following information applies when you use external devices with the Cisco
IP Phone:
Cisco recommends the use of good quality external devices (speakers,
microphones, and headsets) that are 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 screened cables for the external device, or use cables with a better screen
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
will perform adequately when suitable devices are attached using good quality
cables and connectors.
Caution In European Union countries, use only external speakers, microphones, and
headsets that are fully compliant with the EMC Directive [89/336/EC].
Installing the Cisco IP Phone
You must connect the Cisco IP Phone to the network and to a power source before
using it. See Figure 3-1 for a graphical overview of the procedures that follow.
Note Before using external devices, read the “Using External Devices with Your Cisco
IP Phone” section on page 3-8 for safety and performance information.