For iPhone access, the native VPN client built into iOS will connect to the ASA using IPsec VPN just fine.
For Android, you have two choices.. you can either upgrade your ASA to 8.4 and use the Android's native IPsec VPN functionality, or you can use the Cisco AnyConnect Secure Mobility client. In the latter case, you will need both the AnyConnect Essentials license AND the AnyConnect Mobile license.
I figured the AnyConnect licensing would be a no-go based on cost, but I was shocked to find out that Cisco slashed the pricing pretty substantially since last time I looked at it (1+ yr ago).
Table of ContentsIntroductionVersion HistoryPossible Future
UpdatesDocuments PurposeNAT Operation in ASA 8.3+ SectionsRule Types
Network Object NATTwice NAT / Manual NATRule Types used per SectionNAT
Types used with Twice NAT / Manual NAT and Network Obje...
[toc:faq]Introduction:This document describes details on how NAT-T
works.Background:ESP encrypts all critical information, encapsulating
the entire inner TCP/UDP datagram within an ESP header. ESP is an IP
protocol in the same sense that TCP and UDP are I...