Audra Enterprise is equipped with IKEv1 and IKEv2 IPSec site-to-site VPN with all common protocols. Audra supports standard encryption and authentication algorithms to establish encrypted tunnels between branches. These protocols include 3DES, AES,AES256, MD5, SHA, SHA1, SHA256 and others. So, from Audra Enterprise, you can create a site-to-site tunnel with others vendors that supports all the standard IPsec VPNs.