Desktop & Mobile companion site
Even though the universally accepted best practice for the majority of sites is to build a Responsive site, a traditional desktop site with a companion mobile site can still have its place.
Because a Responsive site viewed on a phone is a collapsed version of the desktop site it can mean that vital information is compromised in its presentation. It is sometimes better that content intended to be deliberately, or exclusively, displayed on a phone is best built on a separate mobile site under a mobile sub domain. There are also geo-location aware capabilities that phones have which desktop machines don't.
Fortunately with our long standing pedigree and evolutionary growth through all these types of web site we are well placed to advise you on the best options for you.