[Asterisk-Users] Polycom voice.gain.tx.analog.handset andasteriskecho

[ewr at erols.com]

>|While I'm asking about the Polycom ip500, the answers for all phones 
>|where mic/handset/headset levels are adjustable would be of 
>interest to 
>|many I'm sure.
>|
>|For the ip500, the default value for the handset seems to be 
>|voice.gain.tx.analog.handset="3"

I have a number of IP600s and 601s that I was experiencing occassional echo
with.  I recently upgraded them to firmware 1.6.5, and rather than using my
existing sip.cfg/ipmid.cfg that had been around forever I started fresh with
a completely stock 1.6.5 sip.cfg file.  My echo issues have disappeared
completely.

With the 1.6.5 version of the Polycom firmware the default value for
voice.gain.tx.analog.handset="12".  The default value for
voice.gain.tx.analog.headset="3".  I suspect you should update the entire
<voice> section of the file (if you're not ready to start from scratch)
since it contains default values for AEC, AES, NS, AGC, RXEQ, and TXEQ.  I
have pasted just the <gains> section below in case anyone want to compare it
to their current settings.

      <gains
         voice.gain.rx.analog.handset="0"
         voice.gain.rx.analog.headset="0"
         voice.gain.rx.analog.chassis="0"
         voice.gain.rx.analog.chassis.IP_300="-6"
         voice.gain.rx.analog.chassis.IP_4000="3"
         voice.gain.rx.analog.chassis.IP_601="6"
         voice.gain.rx.analog.ringer="0"
         voice.gain.rx.analog.ringer.IP_300="-6"
         voice.gain.rx.analog.ringer.IP_4000="3"
         voice.gain.rx.analog.ringer.IP_601="6"
         voice.gain.rx.digital.handset="-15"
         voice.gain.rx.digital.headset="-21"
         voice.gain.rx.digital.chassis="0"
         voice.gain.rx.digital.chassis.IP_4000="0"
         voice.gain.rx.digital.chassis.IP_601="0"
         voice.gain.rx.digital.ringer="-21"
         voice.gain.rx.digital.ringer.IP_4000="-21"
         voice.gain.rx.digital.ringer.IP_601="-21"
         voice.gain.rx.analog.handset.sidetone="-14"
         voice.gain.rx.analog.headset.sidetone="-24"
         voice.gain.tx.analog.handset="12"
         voice.gain.tx.analog.headset="3"
         voice.gain.tx.analog.chassis="3"
         voice.gain.tx.analog.chassis.IP_300="0"
         voice.gain.tx.analog.chassis.IP_4000="3"
         voice.gain.tx.analog.chassis.IP_601="0"
         voice.gain.tx.digital.handset="0"
         voice.gain.tx.digital.headset="0"
         voice.gain.tx.digital.chassis="3"
         voice.gain.tx.digital.chassis.IP_4000="0"
         voice.gain.tx.digital.chassis.IP_601="6"
         voice.gain.tx.analog.preamp.handset="14"
         voice.gain.tx.analog.preamp.headset="23"
         voice.gain.tx.analog.preamp.chassis="32"
         voice.gain.tx.analog.preamp.chassis.IP_601="32"/>

-- E