By default, the G.722 codec is enabled for Cisco DX Series devices. If Cisco Unified Communications Manager
is configured to use G.722 and if the far endpoint supports G.722, the call
uses the G.722 codec instead of G.711 to connect.
This situation occurs regardless of whether the user has
enabled a wideband headset or wideband handset, but if either the headset or
handset is enabled, the user may notice greater audio sensitivity during the
call. Greater sensitivity means improved audio clarity but also means that the party at the far end can hear more
background noise, such as rustling
papers or nearby conversations. Even without a wideband headset or handset,
some users may prefer the additional sensitivity of G.722. Other users may find the additional sensitivity of G.722 distracting.
The Advertise G.722 Codec service parameter affects whether wideband support exists for all devices that register with this Cisco Unified Communications Manager server or for a specific device, depending on the Cisco Unified Communications Manager
Administration window where the parameter is configured:
Advertise G.722 Codec field: From Cisco Unified Communications Manager
. The default value of this enterprise
True, which means that all Cisco DX Series devices that register to this Cisco Unified Communications Manager advertise G.722 to Cisco Unified Communications Manager. If each
endpoint in the attempted call supports G.722 in the capabilities set, Cisco Unified Communications Manager chooses that codec for the call whenever possible.
A specific device advertises the G.722 codec: From Cisco Unified Communications Manager
The default value of this product-specific parameter is to use the value
that the enterprise parameter specifies. If you want to override this on a
per-device basis, choose
Disabled in the Advertise G.722 Codec
parameter in the Product Specific Configuration area of the
Phone Configuration window.