I've issue with CME (C2811) and MoH. When I'm calling from PSTN to 1st IP Phone answering, then this IP Phone forwarding call to 2nd IP Phone. In process of forwarding I hear music-on-hold, but when 1st IP Phone pushing button "fwd" or hang-up for make call forward I hear "buzzed" music, like very fast repeated sample, I hear that instead normal rings. When 2nd IP Phone picking up the phone, call process doing well.
PSTN --sip trunk-- C2811 --sccp-- IP Phones
What is wrong with that?