I wish to start this topic by saying that I don't have any experience in the world of SIP and VoIP and I'm here to check if something specific I want can work. I have a contract for television, internet and telephony all via the (coax-)cable (Dutch provider called Ziggo, if relevant). While telephone line is VoIP you can connect any tone dialing phone to it so I think the modem converts the VoIP to a regular analog signal. Now I'm wondering whether I can plug a 56k modem in my PC (or some other PCI card or USB device) and then set up 3CX SIP Server and have it work with the 56k modem. The next step would be that I install the 3CXPhone app on my iPhone and that I can call and receive calls on my iPhone when I'm on my local LAN I don't have a 56k modem (or even a telephone cable to connect it for that matter) so I wish to check whether this can work in the first place and hope you guys can point me in the right direction. Thanks in advance!