External Devices - Cisco 7821 Administration Manual

External Devices

The Cisco IP Phones do not support the following actions:
Transfer
Conference
Join
Hold
Barge
Direct Transfer
Select
Users cannot create conference and transfer calls across different lines.
External Devices
We recommend using good-quality external devices, such as headsets, cables, and connectors, that are shielded
against unwanted radio frequency (RF) and audio frequency (AF) signals.
Note Not all Cisco IP Telephony products support external devices, cords or cables. For more information,
consult the documentation for your endpoint.
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 these 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 external devices, cables, and connectors.
Cisco IP Phone 7821, 7841, and 7861 Administration Guide for Cisco Unified Communications Manager 10.0
(SIP)
14
Only supported in the connected call transfer scenario.
Only supported in the connected call transfer scenario.
Supported using the Conference button or Hookflash access.
Supported using the Hold button or Hold softkey.
Not supported.
Not supported.
Not supported.