Is it possible to have a more than one "itemprop" on the same item? (not nested)

I was wondering if it was possible to have more than one itemprop set for the same element.

E.g. I have a telephone that works also as fax and I would like to set a span with itemprops telephone and faxNumber (using the Product schema). Is it possible to do something like that? I'm pretty sure that this doesn't work as it should

<span itemprop="telephone">
     <span itemprop="faxNumber">(...)</span>
</span>

So, will something like this work instead?

<span itemprop="telephone" itemprop="faxNumber">(...)</span>

If not, is there a way to bypass the problem?