The internet and telephone modem is a single unit. The telephone part connects to a special telephone jack that activates the whole house telephone wiring so you can plug in any phone to any telephone jack and be connected. I don't know for sure about your special phone, but I would suspect that if it works an a regular jack now, it will work with the new system.
The only problem we have had with Comcast telephone is that if the cable goes out, so does your telephone service. We have had the cable cut during some landscaping misadventures and lost telephone as well as TV and internet until it was repaired. But other than those episodes, we have had very few cable interruptions.
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