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I imagine it would be quite difficult to match up the phone call with what version of the website was being used. One idea: depending on how your incoming calls work you could try using different extensions on each version which would let you track it. A different phone number all together would work too, but might be confusing and bad for SEO.

Hi Enjo, great question. I'm curious--how would you use an API to track a phone call? If you can describe the process as you'd implement it in your org, we might be able to suggest (or build!) a solution..

Couldn't you setup 2 numbers and just A/B that along with whatever else you're changing?