Speakerphone; Headset - Cisco CP-3911 - Unified SIP Phone 3911 VoIP Administration Manual

Chapter 3 Setting Up the Cisco Unified IP Phone
Network Port
Handset

Speakerphone

Headset

Cisco Unified SIP Phone 3911 Administration Guide for Cisco Unified Communications Manager
OL-14029-01
The back of the Cisco Unified SIP Phone 3911 has a port that you use to connect
to the network.
The handset is designed especially for use with a Cisco Unified SIP Phone. To
connect a handset to the Cisco Unified SIP Phone, plug the cable into the handset
and the Handset port on the back of the phone.
The Cisco Unified IP Phones has a speaker on/off button. To change from
speakerphone to handset, lift the handset.
Although Cisco Systems performs some internal testing of third-party headsets
for use with the Cisco Unified IP Phones, Cisco does not certify or support
products from headset or handset vendors. Because of the inherent environmental
and hardware inconsistencies in the locations where Cisco Unified IP Phones are
deployed, there is not a single "best" solution that is optimal for all environments.
Cisco recommends that customers test the headsets that work best in their
environment before deploying a large number of units in their network.
In some instances, the mechanics or electronics of various headsets can cause
remote parties to hear an echo of their own voice when they speak to Cisco
Unified IP Phone users.
Cisco Systems recommends the use of good quality external devices, like 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 cell phones and two-way radios, some audio noise may still
occur.
Understanding the Cisco Unified IP Phone Components
3-5