Polycom Trio 8800 User Manual page 27

The network bandwidth necessary to send the encoded voice is typically 5–10% higher than the
encoded bit rate due to packetization overhead. For example, a G.722.1C call at 48kbps for both the
receive and transmit signals consumes about 100kbps of network bandwidth (two-way audio).
Audio Codec Parameters
You can configure a set of codec properties to improve consistency and reduce workload on the phones.
Use the parameters in the following table to specify the priority for audio codecs on your Polycom phones.
If 0 or Null, the codec is disabled. A value of 1 is the highest priority.
If a phone does not support a codec, it treats the setting as if it were 0 and not offer or accept calls with that
codec. The phone ignores the unsupported codec and continues to the codec next in priority. For example,
using the default values, the VVX 310 doesn't support G.722.1C or G.719 and uses G.722.1 as the
highest-priority codec.
Polycom, Inc.
Audio Features
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