Music on Hold for external calls

[ewild]

Hi,
I have problems with the Music on Hold only on external calls !!! Internal calls works fine !!
I already changed the options on troncal options. Disabling reinvite and replaces, activating Audio from PBX
What is wrong ???
Thanks in advance

 

[bigohio]

I have the same issue with a client. We believe it's the client's Watchguard but need more evidence.