Polycom SOUNDPOINT SIP 2.2.0 - Manual (Page 152)

Administrator’s Guide SoundPoint IP / SoundStation IP
A - 40
Acoustic Echo Cancellation
These settings control the performance of the speakerphone acoustic echo
canceller.
.
Polycom recommends that you do not change these values.
Attribute Default
voice.aec.hs.enable 0
voice.aec.hs.lowFreqCutOff 100
voice.aec.hs.highFreqCutOff 7000
voice.aec.hs.erlTab_0_300 -24
voice.aec.hs.erlTab_300_600 -24
voice.aec.hs.erlTab_600_1500 -24
voice.aec.hs.erlTab_1500_3500 -24
voice.aec.hs.erlTab_3500_7000 -24
voice.aec.hd.enable 0
voice.aec.hd.lowFreqCutOff 100
voice.aec.hd.highFreqCutOff 7000
voice.aec.hd.erlTab_0_300 -24
voice.aec.hd.erlTab_300_600 -24
voice.aec.hd.erlTab_600_1500 -24
voice.aec.hd.erlTab_1500_3500 -24
voice.aec.hd.erlTab_3500_7000 -24
voice.aec.hf.enable 1
voice.aec.hf.lowFreqCutOff 100
voice.aec.hf.highFreqCutOff 7000
voice.aec.hf.erlTab_0_300 -6
voice.aec.hf.erlTab_300_600 -6
voice.aec.hf.erlTab_600_1500 -6
voice.aec.hf.erlTab_1500_3500 -6
voice.aec.hf.erlTab_3500_7000 -6