We've had a site-to-site VPN tunnel configured between 2 locations for at least 2 years, and we've never had problems with the Cisco IP phones at the remote site functioning. All of a sudden, the phones at the remote location all show they are trying to register. There is a UC540 at the host location, and there have never been any DHCPD options in the remote ASA configuration. The sites are very static in their configuration, so I'm not sure where to even start checking things out. I'd appreciate any suggestions. Thanks