Take a look at this blog post and let me know what you think.
Now that administrators will have a choice, when would you allow mobile workers to connect to their collaboration services from outside the firewall via a secure TLS-connection?
And when would you want them to connect via a layer 3 VPN client such as Cisco AnyConnect?
Are there situations where both are needed?
New features in X8.5
(Preview) MRA support for new endpoints
Mobile and Remote Access via the Expressway is now compatible with the Cisco DX Series endpoints, and with the 8800 Series and 7800 Series IP phones.
What is the firmware version needed for the DX650, 8800/7800 series?
It's the same firmware update as Kevin mentioned above 10.3.1 which applies to both 7800 and 8800 Series. Target is for end of month to GA (single line support only at that time). Multi-line support has some additional development needed on the Collaboration Expressway side - target summer 2015.
Document I'm looking at confirms 10.3.1 for support of transfer, pickup, park, forward that you mentioned. Corporate Directory (no - roadmap for a second phase as requires more development on expressway side and target is 2H CY2015). Does not specifically call out soft keys so have to check with BU on that.