i could use some advice please. I have a cisco 1841 and it is sat in front of an asterisk High Availability cluster but I have nailed down access via the extended ACL. I have some clients that want to connect via sip clients on their mobile phones however I cannot cater for a dynamic IP coming into our voice network.
The only option that I can see is a VPN. iPhones etc can cater for pptp, L2tp and ipsec. could you guide me to the best choice please and maybe point me to a run through of how to set it up please?
I heard also that you have to have a cisco license to run ipsec is that true?