I currently have several site offices connected to my head office via site-to-site VPNs. My head office is the only office with a static IP and all site offices have dynamic public IPs that change daily thanks to our ISP. Due to the high cost of static IPs in my region, I'd like to explore the possibility of using an Azure VPN gateway to remove the need for a static IP from my head office. All the documentation I've seen leads me to believe that this is not possible but I thought I'd throw the answer out to the community in case I am mis-reading something here (it is perfectly acceptable in my situation for each site to be the 'initiator' of the connection if that makes any difference). Is this possible at all or am I required to have static IPs on each site (or at least update them whenever they change)?