Forwarded calls no sound

Alright in my haste (or lack of attention) I didn’t realize that my forwarded calls have no sound at either end eg. caller callee. This is probably contributing to a host of other problems. Does anyone know why calling extensions is clear and working, calls directly outbound and inbound are working, but calls forwarded have no sound? BTW there is no firewall involved in case anyone was thinking that might be it.