MOH during a call

Hello everyone, this is my first post on the forum, I have a problem I can not solve.

I have several clients running Asterisk 10.12 + Freepbx 2.11 and all i have the same problem related music on hold.

During the call enters the call waiting for both sides of the call and there is no way to cancel without turning off the phone.

Occurs in all types of environments with outgoing calls for a SIP trunk, Yealink IP phones, softphone Bria, Eyebeam softphone, softphone Blink, dahdi extensions (channel bank).

I did not detect any abnormality in the logs.

Anyone have any idea what it might be?