I realize this is an old thread, but I'm currently configuring my AnyConnect Phone VPN. I've been able to get my VPN Clients on desktops to connect but the weird thing is, they can ping anything on our network except for the CUCM.
I'm thinking it's because the CUCM's IP is being held for the Phone Proxy sessions.
Did you have this experience too?
I'm looking for a way around this as I don't want to have to eliminate Phone Proxy completely to get AnyConnect working, especially since I'd like to test the reliability of AnyConnect IP Phone VPN before forcing our currently deployed Proxy Phones onto it.