Poor Audio Volume

We just install a new P560 system.  Previously we've used S100 and S300 units.  Overall we really like the interface of the device, but our users can barely hear anyone.  This is whether the call is between handsets or inbound from the SIP trunk.  The SIP provider is the same between the S100 and P560 units and many of the extensions are the same model of Yealink phones.  So the only real variable is the P560.  Is there an easy way to increase the RXGain and TXGain?

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