I got my 1721 configured for ADSL using the FAQ here. Everything works like a charm. The router also has a WIC-1AM for dial backup. I can't seem to be able to find a comprehensive guide on how to configure it to dial to an ISP (regular dial-up account using PPP and PAP), and make sure that my NAT and ACLs work with the backup link. I'm leaning towards using another Dialer interface. Any suggestions would be appreciated. I can post the config.