Hi. We have a remote site that connects to the internet via a Cisco 1801 Integrated Services router plugged into an ISDN line. Ths line only has dynamically assigned public IPs and I'm wondering if it's possible to create a site VPN back to our head office Pix 515 without a static IP at the remote site. Any pointers would be greatly appreciated.
I should also point out that this site already connects to head office via an ADSL line connected to the 801 with a static IP which is working fine. The ISDN is for backup.