Can i use unc or ucwa web api to build android and windows phone app ?

is there anyway to develop custom client application using unc web api ( android, ios, windows phone ) with following features
App to app audio / video calling
App to app audio conference call
App to app messaging 
 

Instant messaging is perfectly supported already by UCWA, audio/video are not at this moment.
UCWA can be used by any platform/device that can 'speak HTTP', so yes the platforms you mentioned are suitable UCWA clients.
You may adopt third party solutions and combine them with UCWA within your app in order to achieve audio/video call support.
HTH
Massimo Prota
.NET MCAD - SP2007 MCTS - SP2010 MCPD and MCITP
My blog: http://blogs.ugidotnet.org/mprota - Twitter:
@massimoprota

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