Dynamic IP's and remote access to VM system

I am a phone man who installs VM on premise and the feature to access the VM is very handy. It is hard to convince a client to go to a static IP just so I can get in, so this service would help me tremoundously. I would hope this is fairly transparent for anything other than the IP provided by the ISP. Some of my smaller business customers have dynamic IP's because there is really no need for a static one. Any options or other ways to achieve this would be helpful.