I am using 3cx with a Audiocodes MP-202 analog adapter. Calls send and receive fine, and the voice quality is fine for most of the call. But exactly every 59 seconds during a call there is a short, loud squeal, like a radio squelch noise, that I hear on my side. The person on the other end of the call just hears a click. Is this likely to be caused by the 3cx setup, MP-202 adapter, or my VOIP provider? I really don't know where to start troubleshooting. I've tried changing codecs between the MP-202 and the 3cx but that didn't change anything. Thanks in advance for any suggestions or assistance.