OBi110 to phone volume too high!

[Sanjuro]

I just set up my OBi110 with GV and it works great.  However the call volume coming out of the phone is crazy loud, even after I went into advanced settings and set ChannelTxGain to -12 for the PHONE port.  Any other places I can tweak to make the OBi to phone volume lower?

[LeftRight]

Phone Port "ChannelTxGain" is really the only place for you to adjust the volume, if that does not make much difference to you (any difference?), you may consider using a different analog phone for a try ...

[Sanjuro]

Thanks LeftRight.  It does make a difference, but I discovered the true cause of the problem:

My Polycom Soundstation 2 apparently has been known for its massive volume.  I tried it on another phone and the volume was ok.  Solution resulted in keeping ChannelTxGain at -12 and putting a mug over the conference phone.