IVR dating - phone chat on VOIP

We are looking for experienced programmers to develop a IVR dating system, on VOIP preferably. This needs to be very similar to this one located at 514-362-8888 . The system will be in French, so it is a plus if you do speak french. We are familiar with analog and Dialogic cards, but we'd really like this to be solely VOIP if possible. We will need to be guided cause we don't know much about how VOIP and ASterix really work. Thank you