Polycom 1725-11530-310 manual Background Noise Suppression, Comfort Noise Fill

						Configuring Your System
							Effective
				Sample			audio
Algorithm	MIME Type	Ref.	Bit Rate	Rate	Frame Size		bandwidth
Siren14	SIREN14/	SIREN14	24 Kbps	32 Ksps	20ms - 80ms		14 KHz
	16000		32 Kbps
			48 Kbps
Siren22	SIREN22/	SIREN22	32 Kbps	32 Ksps	20ms - 80ms		14 KHz
	48000		48 Kbps
			64 Kbps
RFC 2833	phone-event	RFC 2833	N/A	N/A	N/A		N/A

	Note		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 consumes 5xkbps of network bandwidth (one-way audio).
			Two-way audio would take over 100kbps.
			Configuration changes can performed centrally at the boot server or locally:
Central		Configuration file:		Specify codec priority, preferred payload sizes, and jitter buffer tuning
(boot server)		sip.cfg		parameters.
				• For more information, refer to Codec Preferences <codecPref/>
				on page A-38 and Codec Profiles <audioProfile/> on page A-41.
Local		Web Server		Specify codec priority, preferred payload sizes, and jitter buffer tuning
		(if enabled)		parameters.
				Navigate to http://<phoneIPAddress>/coreConf.htm#au
				Changes are saved to local flash and backed up to <Ethernet
				address>-phone.cfgon the boot server. Changes will permanently
				override global settings unless deleted through the Reset Local
				Config menu selection and the <Ethernet address>-phone.cfgis
				removed from the boot server.

Background Noise Suppression

Background noise suppression (BNS) is designed primarily for hands-free operation and reduces background noise to enhance communication in noisy environments.

There are no related configuration changes.

Comfort Noise Fill

Comfort noise fill is designed to help provide a consistent noise level to the remote user of a hands-free call. Fluctuations in perceived background noise levels are an undesirable side effect of the non-linear component of most AEC

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