i remember i have try a day skype to sip with windows software he is a similaire as freepbx and after you can add skype as sip trunk in your vicidial but you need let skype opened also you need use eyebeam?
so here i think he is not a good solution for work beacause we need use two softphone in same time "skype+eyebeam"
we know skype have a good Quality of VOIP but as i know he is not professional
for exemple we can not make over 50 call per day also the convertion of skype to sip then to vicidial is too long
seach and use a good voip sip or iax product and provider.
and 50 seats with skype this is not a good solution.
don't try it