[Freeswitch-users] weirdness.. low audio levels to provider..

Hi All, I've got a weird one.. Calls between endpoints are fine, but calls outside suffer from my side having very low audio levels. Both for incoming calls and outgoing calls. I tried the set_audio_level write =4 bit but no effect. My provider is pennytel - previously I've gone direct from the 3102 with no level issues Any hints? what would be useful for diagnosis? Thanks Bret