I'm having some problems with this video phone door system :
VTO6110B(outdoor) + VTO1210A-X(outdoor) => VTH1560B (indoor)
VTH1560B is running V1.100.0000.0.R.20131224
VTO1210A-X is running 2013-04-26 V1.110.0.0
VTO6110B is running 2014-06-23 V1.000.0.0 and 2013-04-26 V1.110.0.0
No matter which one is the setup as the Main_VTO, the VTO1210A-X sound is garbled. I figure it's a codec problem that would be easily solved with a firmware upgrade but I can't find one for them.