Polycom SoundPoint IP 601 - Manual (Page 366)

Administrator’s Guide Addendum for the Polycom VVX 1500 Business Media Phone
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Gains <gain/>
The default gain settings have been carefully adjusted to comply with the
TIA-810-A digital telephony standard for the Polycom VVX 1500 phone.
Polycom recommends that you do not change these values.
Attribute Default
voice.gain.rx.analog.handset.VVX_1500 -2
voice.gain.rx.analog.handset.sidetone.VVX_1500 -15
voice.gain.rx.analog.headset.VVX_1500 -2
voice.gain.rx.analog.headset.sidetone.VVX_1500 -31
voice.gain.rx.analog.chassis.VVX_1500 -3
voice.gain.rx.analog.ringer.VVX_1500 0
voice.gain.rx.digital.chassis.VVX_1500 0
voice.gain.rx.digital.ringer.VVX_1500 -21
voice.gain.tx.analog.handset.VVX_1500 -48
voice.gain.tx.analog.headset.VVX_1500 -47
voice.gain.tx.analog.chassis.VVX_1500 -25
voice.gain.tx.digital.handset.VVX_1500 12
voice.gain.tx.digital.headset.VVX_1500 12
voice.gain.tx.digital.chassis.VVX_1500 6