A couple of users here are experiencing an issue when they try to transfer a call, the receiver can't hear them speaking so they can't announce the caller.

Now, disclaimers, I started here a week ago, I'm new to Ringcentral. My predecessor did a pretty good hand over for most of it but didn't mention this issue. The users say its been an issue for a few months now so it looks like it had him stumped too.

Where do I begin to look? Thanks for your pointers in advance.