@blastagator - could you describe what is the process to patch a modem ? I want to see if I can patch the D803 modem by Dr_87 - we are having trouble with skype on the latest CM12 roms.
On the droid razr we had a similar issues with artificial voice simulation/voip problems and i remember a fix someone patched rom related that addressed both issues temporally.The patch if i recall set voice simulation/voip to mono and things worked.
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