ISA 2004 site to site VPN

Hi All,
  I have a working ISA 2004 site to site vpn working between the main and branch office, both are using static IP, now my branch internet will be changed and no more static IP address will be available, I need to change the setup so that my main ISA site ( static IP ) connects to branch ISA ( dynamic DNS ), kindly advise if its possible

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ISA / TMG SiteToSite only works with IP(4) addresses, not with names, so no built in support for SiteToSite with dynamic addresses.  
Nevertheless there are some guys out which wrote some code to tell TMG the actual address of a dynamic endpoint.
If this works also for ISA 2004 you may have to try out.
Also a point is, that you have to trigger the scripts via scheduler...
Not the most comfortable solutions, but the only way I know....

One of them you can find in this blog....

More scripts you may find searching for "TMG site to site vpn ddns".

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