- ページ 12

IP電話 Cisco 3911のPDF ユーザーマニュアルをオンラインで閲覧またはダウンロードできます。Cisco 3911 42 ページ。 Unified sip ip phone
Cisco 3911 にも：データシート (5 ページ), ユーザーマニュアル (14 ページ)

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. See

Using External Devices, page

2, for more information.

The primary reason that a particular headset would be inappropriate for the Cisco Unified IP Phone

is the potential for an audible hum. This hum can be heard by either the remote party or by both the

remote party and you, the Cisco Unified IP Phone user. Some potential humming or buzzing sounds

can be caused by a range of outside sources, for example, electric lights, being near electric motors,

large PC monitors. In some cases, a hum experienced by a user may be reduced or eliminated by using

a local power cube or power injector.

Audio Quality Subjective to the User

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 or handsets, but some of the headsets and handsets on the

sites listed below have been reported to perform well on Cisco Unified IP Phones.

Nevertheless, it is ultimately still the customer's responsibility to test this equipment in their own

environment to determine suitable performance.

For information about headsets, see:

http://www.vxicorp.com/cisco

http://www.plantronics.com

http://www.jabra.com

OL-14030-01