When you click on a phone number on a web site and Lync opens the window with the "Click to call" button, there is no way to change the device. You must either change the default device before clicking the number on the website, or, establish the call and THEN change the device.
Right now, if you attempt to join a meeting and get placed in the lobby, you can't adjust/change devices. It would be nice if you could change devices before entering the meeting, while in the lobby.
The only supported clients for response groups are: Lync 2013
Lync 2010 Attendant
Office Communications Server 2007 R2 Attendant Lync Phone Edition
We would like to use phones such as a Wifi phone or a CX600 phone, or possible a mobile phone with the Lync client. All of these are not supported scenarios.