Hi,
Theoretically you could use Vyew on dial-up, as long as you don’t use the voice or webcam options. However it’s not optimized for dial-up, so it will likely take extremely long to load the application, like 5 minutes or more.
Vyew is completely free to try, you don’t even need to register or sign up to test it out, so if you’re patient, you can give it a go.