Wireless Voice over IP

Dear forum members, I have deployed quite a few WLAN environmnets but none so far for
Wireless VoIP.
If I have to design a system for both data and Voice isnt reccomended to create 2 VLANs/ 2 SSIDs, one for voice and one for Data?
Also what needs to be done on the Controller to accomodate the Voice?  what are the authentication mechanisms?
Anyone has any great document to share?
i would appreciate your help on the matter.
AS

Please don´t forget:
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http://www.cisco.com/en/US/docs/wireless/technology/vowlan/troubleshooting/VoWLAN_Troubleshooting_Guide.pdf
Peter
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