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Adjusting IP Phone Call Recording volume

We just implemented a SIP based call recording solution for a CallManager 6.1 system.  The Recording Profile, SIP trunk, router pattern, etc has been configured and calls are being recorded.  The problem we are having is that many of the recorded calls have very low volume, and can only be heard on the workstation by using headphones with the volume turned all the way up.  It's mainly the external caller that is very quiet, the IP phone user is louder.  I know increasing the input gain on the voice port may help some, but no users are complaining about callers being too quiet, it seems to only be on the recordings.  Is there any way to increase the volume from the IP phone to the recording server?  The recording server does not have any way to increase the volume as it decodes the streams to mp3 format.  Thanks.

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