I have a customer that I just switched over to SIP trunks from POTS lines. I had an option setup in the voicemail (VMAC) to transfer off premise before that worked fine with 9+7405551212 but I can't get it to work now. I have tried 9p, 9n, 9;, 9,....Does anyone know what I need to check to get this option working again?

Thanks