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Cisco Unified IP Phone 8961, 9951, and 9971 Administration Guide for Cisco Unified Communications Manager 8.5 (SIP)
OL-20861-01
Chapter 3 Setting Up the Cisco Unified IP Phone
Installing the Cisco Unified IP Phone
Using External Devices
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 will perform adequately when suitable devices are
attached using 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].
Installing the Cisco Unified IP Phone
You must connect the Cisco Unified IP Phone to the network and to a power source before using it. See
Figure 3-2, Figure 3-4 and Figure 3-6 for graphical representations of the back connections for Cisco
Unified IP Phones 8961, 9951, and 9971, respectively. See Figure 3-3, Figure 3-5, and Figure 3-7 for
graphical representations of the side connections for Cisco Unified IP Phones 8961, 9951, and 9971,
respectively.
Note Before you install a phone, even if it is new, upgrade the phone to the current firmware image.
Before using external devices, read the “Using External Devices” section on page 3-11 for safety and
performance information.
Note Firmware upgrades over the WLAN interface may take longer than upgrading over the wired interface,
depending on the quality and bandwidth of the wireless connection. Some upgrades may take more than
hour.