The ASA5555 can certainly do IPsec tunnels for site to site VPN. But as far as I know the 5555 does not have support for GRE. I worked with a customer who achieved something similar by having a router inside the ASA. They configured a GRE tunnel from the router to a router on the remote side. Then they configured an IPsec tunnel from the ASA to the peer and made sure that the crypto ACL on the ASA included GRE as traffic to carry over the tunnel.
HTH
Rick
HTH
Rick
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