Looking to switch over to a hosted VoIP phone system at my office, right now just have analog phone lines no PBX.  My concern is that right now when I need to connect to a customer's alarm panel remotely that is still on a POTs line I dial in using Starcomm modem (Napco alarm panels) on my fax line.  A SIP provider spec'd me out a system with an Obihai Obi302 ATA device for my fax machine but cant really tell me if my modem will be able to dial out over it. Does anyone have any experience with this?