Acoustic Echo Cancellation AEC | Polycom Version 1.4.x 17 specification

Administrator Guide - SoundPoint® IP / SoundStation® IP

Features

3.3.7 Acoustic Echo Cancellation (AEC)

The phone employs advanced acoustic echo cancellation for hands-free operation. Both linear and non-linear techniques are employed to aggressively reduce echo yet provide for natural full-duplex communication patterns.

3.3.8 Audio Codecs

The following table summarizes the phone’s audio codec support:

				Sample		Effective
				Sample		audio band-
Algorithm	MIME Type	Ref.	Bit Rate	Rate	Frame Size	width

G.711∝-law	PMCU	RFC	64 Kbps	8 Ksps	10ms - 80ms	3.5KHz
		1890

G.711a-law	PCMA	RFC	64 Kbps	8 Ksps	10ms - 80ms	3.5KHz
		1890

G.729AB	G729	RFC	8 Kbps	8 Ksps	10ms - 80ms	3.5KHz
		1890

SID	CN	RFC	N/A	N/A	N/A	N/A
		3389

RFC 2833	phone-event	RFC	N/A	N/A	N/A	N/A
		2833

	Configuration file:	Specify codec priority, preferred payload sizes, and jitter
Central	ipmid.cfg	buffer tuning parameters.
Central		For more information, see
(boot		For more information, see
server)		• 4.6.1.6.1.1 Codec Preferences <preferences/> on
		page 79, and
		• 4.6.1.6.1.2 Codec Profiles <profiles/> on page 79.

	Web Server	Specify codec priority, preferred payload sizes, and jitter
	(if enabled)	buffer tuning parameters.
		Navigate to: http://<phoneIPAddress>/coreConf.htm#au
Local		Changes are saved to local flash and backed up to <Ethernet
Local		address>-phone.cfg on the boot server. Changes will per-
		manently override global settings unless deleted via the
		Reset User Settings menu selection.

	Local Phone User	None.
	Interface

44	Copyright © 2004 Polycom, Inc.

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Polycom Version 1.4.x 17 manual Acoustic Echo Cancellation AEC, Audio Codecs

Contents

Administrator Guide SoundPoint/SoundStation IP SIP Polycom, Inc Table of Contents Presence and Instant Messaging Features Optimization Session Initiation Protocol SIP 131 Protocol Extensions 138 Administrator Guide SoundPoint IP / SoundStation IP Overview Administrator Guide SoundPoint IP / SoundStation IP Overview Installation and Operation Installation Models Basic Network Setup Installation ProcessPhones boot up in two phases Dhcp or Manual TCP/IP Setup Local User Interface Setup Menus Access to Network Configuration MenuMain Menu Name Possible Values a Description Dhcp Menu Name Possible Description Values Server Menu Name Possible Values Description Reset to Factory Defaults Application ConfigurationAdvantages of using a boot server Configuration Files Centralized ConfigurationFTP vs. Tftp Master configuration files contain four XML attributes Default Master Configuration File Application Configuration Files Category Description Example Deploying a Boot Server for the Phones Step Instructions Account-by-account basis Local Phone Configuration Passwords Basic Features Call TimerCall Log Phone maintains a call log. The log Call Waiting Called Party IdentificationCalling Party Identification Missed Call Notification Configurable Feature Keys SoundPoint IP 300 SIP Key Layout SoundStation IP 4000 SIP Key Layout Key ID IP 600 Function Connected Party Identification Context Sensitive Volume ControlCustomizable Audio Sound Effects Message Waiting Indication Distinctive Incoming Call Treatment Administration Distinctive Incoming Call Treatment Distinctive RingingDistinctive Call Waiting For more information, see 3.1.16 Local Contact Directory on Do-Not-Disturb Handset, Headset, and Speakerphone Local Contact Directory Local Contact Directory File Format Local Contact Directory File example Element Permitted Values Interpretation Microphone Mute Local Digit MapMultiple Call Appearances Shared Call Appearances Bridged Line Appearances Customizable Fonts and Indicators Boot Server Soft Key-Driven User Interface Speed Dial Time and Date Display Idle Display Animation Automatic Off-hook Call Placement Call Management FeaturesCall Hold Three-Way Conference, Local or Centralized Call TransferCall Diversion Call Forward Directed Call Pick-up Group Call Pick-up Call Park / Retrieve Audio Processing Features Low-Delay Audio Packet TransmissionJitter Buffer and Packet Error Concealment Last Call Return Local Conference Mixing Voice Activity Detection VAD Dtmf Tone Generation Dtmf Event RTP Payload Audio Codecs Acoustic Echo Cancellation AECFollowing table summarizes the phone’s audio codec support Presence and Instant Messaging Features Background Noise Suppression BNSComfort Noise Fill Automatic Gain Control AGC Instant Messaging Localization FeaturesMultilingual User Interface Name Range +FF00 U+FFFF Downloadable Fonts Synthesized Call Progress Tones Advanced Server Features Voicemail Integration Multiple Registrations Password, and an optional array of registration servers ACD login / logout ACD agent available / unavailable Server Redundancy Accessory Internet Features Security FeaturesLocal User and Administrator Privilege Levels DNS SIP Server Name Resolution Incoming Signaling Validation Source IP address validation Digest authentication Both Administrator Guide SoundPoint IP / SoundStation IP Ethernet Switch Application Network SetupSoundPoint IP Switch Port Priorities RTP Ports Working with Network Address Translation NAT Updating and Rebooting For TFTP, refer to 2.2.2.1.1 FTP vs. Tftp on Manual Reboot Menu Option or Key Presses Centralized RebootPeriodic Polling For Upgrades Event Logging Audio Quality Issues and VLANs Log files uploaded in this manner are named IP TOS Ieee 802.1p/Q Rtcp Support Page Core Configuration ipmid.cfg Configuration FilesLocalization localization Multilingual multilingual Attribute Permitted Interpretation Values Adding New Languages Date and Time datetime Call Progress Tones callProgTones User Preferences userpreferences Attribute Permitted Default Interpretation ValuesPermitted Attribute Values Interpretation Tones tones Dual Tone Multi-Frequency Dtmf All three blocks use the same chord set specification format Chord Sets chordsets Following sampled audio Wave file .wav formats are supported Attribute Permitted Values Interpretation Sound Effects soundeffects Patterns patterns Instruction Meaning Example Call Progress Patterns Call progress Use within phone Pattern number Ringer pattern Default description Number Ringer Patterns Miscellaneous Patterns Ring type ringTypeMiscellaneous Use within phone Pattern number Voice Coding Algorithms codecs Voice Settings voiceFollowing voice codecs are supported Codec Preferences preferences Attribute Codec Profiles profiles Volume Persistence volume Attribute Values Default Interpretation Attribute Default Gains gains Acoustic Echo Cancellation AEC Acoustic Echo Suppression AES Background Noise Suppression NS Automatic Gain Control AGC Receive Equalization Rxeq Transmit Equalization Txeq Voice Activity Detection VAD Quality of Service QOSEthernet Ieee 802.1p/Q Ethernet IP TOS IP Other Other Attribute Permitted Values Default Basic TCP/IP TcpipNetwork Monitoring netMon Time Synchronization Sntp Stop DST on the last Sunday in October at 2 am RTP RTP Attribute Permitted Default Interpretation Values Port port Configuration cfg Web Server Httpd Call Handling Configuration call Directory directory Hold, Local Reminder localReminder Fonts font SoundPoint IP Attribute Permitted Values Default InterpretationExample of use 1.12.1 IP500 font IP500 Keys keys1.12.2 IP600 font IP600 Following table lists the functions that are available Function ColdBoot Conference LocalDirectory Macro Messages Indicators indicators Bitmaps bitmapsPlatform IP300/, IP500/, IP600/ and IP4000 Bitmaps used by the phone are defined in this section Animations Animations/ IP300/, IP500/, IP600/ and IP4000 Classes Classes Assignments AssignmentsFollowing table, x is the LED number LEDs led Event Logging logging Level Interpretation Three formats are available for the event timestamp Basic Logging level/change/ and renderType Example Scheduled Logging Parameters scheduled These settings affect security aspects of the phone Password Lengths pwd/lengthSecurity security Provisioning provisioning RAM Disk RAMdisk Delay delay Request request Feature feature Finder finder Resource resourceQuotas quotas Default Interpretation MicroBrowser microbrowserMain Browser main Browser Limits limits 112 Copyright 2004 Polycom, Inc SIP Configuration sip.cfg Protocol volpProtLocal local Attribute Permitted Server server SIP SIP Invite Update Request Validation requestValidation Attribute Conference Setup conference Attribute Default Interpretation Ues Dial Plan dialplan Routing routing SIP Logging logging/ level/ change Emergency emergency Per-phone Configuration phone1.cfg Registration reg 122 Copyright 2004 Polycom, Inc Automatic Off-hook Call Placement autoOffHook Missed Call Configuration serverMissedCallCalls call Do Not Disturb donotdisturb Diversion divert Figured as shared Calls can be automatically diverted when the phone is busy Forward All fwdBusy busy No Answer noanswer Dial Plan dialplan Phone can automatically divert calls when DND is enabledDo Not Disturb dnd Digit Map digitmap Routing routing Messaging msg URL Message Waiting Indicator mwi Network Address Translation nat 130 Copyright 2004 Polycom, Inc Basic Protocols RFC and Internet Draft SupportRequest Support Title Header Support Header Supported Copyright 2004 Polycom, Inc 133 Response Support 4.1 1xx Responses Provisional4.2 2xx Responses Success Response Supported 4.3 3xx Responses Redirection 4.4 4xx Responses Request Failure 4.5 5xx Responses Server Failure 4.6 6xx Responses Global Failure Hold Implementation Reliability of Provisional ResponsesTransfer Third Party Call Control Protocol Extensions Phone supports the following SIP protocol extensions Bridged Line Appearance Signaling Shared Call Appearance SignalingOr their successors