OK, that's is a Bell 554 wall phone. Same guts as the 500, though. One would need a pulse-to-tone converter to dial out on VoIP (using the dial!). They're not cheap though!
Of course, one could also use one of those old-school portable tone dialers that are held up to the mouthpiece, But, of course, that takes away the thrill of using the rotary dial.
Those things are the exact opposite of the old fashioned touchtone converters that were used when connecting a touchtone phone to a step-by-step switch. A lot of independent phone companies had that kind of setup back in the day.
I can remember being able to use my calling card without operator assistance using one of those payphones. I had to dial an 800 number to connect to my long distance carrier (Sprint). The payphones were post pay and the phone company made any calls starting with 1 go immediately to a reorder. In order access my carrier I had to dial 0+800 instead of 1+800. Once I connected I could touchtone out the number I was calling and the calling card number with no problem. Ahh, the memories.
Now the old steps are gone and replaced with digital switches even in the most remote areas. -- Calling an illegal alien an undocumented worker is like calling a crack dealer an unlicensed pharmacist.