Apple iPhone 2.0 software supports Cisco IPSec, L2TP over IPSec and PPTP VPN connections. We have tested this successfully with a VPN connection running on Apple's Mac OS X Server software (L2TP) and a Cisco ASA 5505.
Note: we tried using a Cisco PIX 501, but discovered iPhone's VPN requires Version 7.2.x or higher on the PIX (version 6.x will not support iPhone 2.0 IPsec clients). More information is below:
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