Wideband Codec Setup
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 Administration, choose . The default value of this enterprise parameter is 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 Administration, choose . 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 Enabled or Disabled in the Advertise G.722 Codec parameter in the Product Specific Configuration area of the Phone Configuration window.