The mobile devices license on ASA appliances allows mobile devices to use a VPN tunnel to connect back to the ASA. it's an "enabling / feature license" so rather than purchasing one per user you purchase it for the ASA just once. It must be used in conjunction with AnyConnect essentials or AnyConnect premium. Essentials is another example of a "enabling license" you purchase it once and you get the full number of basic VPNs tunnels available on your box. Premium is a per user license, you purchase the number of premium user licenses required for your number of users.
An example of these licenses combined would be:
An ASA5550 with 1000 devices, which could be mobile devices, laptops, destops etc. You would require:
The Appliance:
1 x ASA5550-BUN-K9
The SSL Premium Licenses or Essential Licenses:
1 x ASA5500-SSL-1000 or 1 x ASA-AC-E-5550
And the Mobile Devices License
1 x ASA-AC-M-5550
If using premium SSL licenses the number can be raised or lowered depending on the number of users you have, the mobile license would be unaffected, you purchase this once and thats that.
On a side note AnyConnect essentials and premium are mutually exclusive, you cannot have both, you either have to have essentially VPNs or premium VPNs.
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