[Asterisk-Users] low call volume

[billy]

i have AAH connected to pstn via digium TDM01B
 
had been testing it on telewest line (UK cable company) with very little
issues.
now moved to a BT line and had several that i anticipated from infomation on
this list.
the one that has caught me out is low volume from the caller via pstn. 
 
using sipura spa-941's and have to push the volume up to hear.
is there a setting that can correct this
 
thanks
 
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