Just did some syslogs and traces with support today. The more info we provide the quicker a resolution can be found. They are also talking about Custom ring tone 3 but in my case these are the default ringtones.
Strange thing I noticed today was when the phone was in the fault condition the Speaker/ Handsfree Mode didn’t work either. The phone would go off hook with no sound through the speaker.
Other things customers have described is answering a call by picking up the handpiece and the call goes to handsfree and on other occasions answering a call and taking to the caller and still having a ringing tone in the earpiece.
Can I ask if this is a 3CX install and if you use GDMS to control the handsets?