chromolume

Hi: I am unsure if Axon can do this but it at least appears it may. We have an employee working off-site from our network who have an IP Phone. Does anyone know how to set up their softphone so that an extension in Axon rings to their IP Phone? Unfortunately our attempts at doing this to this point have failed. We have been unable to access our network "offsite" through the internet. Any help would be greatly appreciated. Thank you!