The open operation did not complete within the allotted timeout error in WCF dual binding

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WCF

MVC

I have created a WCF service with call back using WSDualHttpBinding. I have hosted the service in Windows Azure.

If i am call WCF then display error :- "The open operation did not complete within the allotted timeout of 00:05:00. The time allotted to this operation may have been a portion of a longer timeout."
i have add code in web config file.
(

binding name="WSDualHttpBinding_IService1" closeTimeout="00:02:00"
          openTimeout="00:02:00" receiveTimeout="00:02:00" sendTimeout="00:02:00"
          clientBaseAddress="http://mcwebservice.azurewebsites.net"
          maxBufferPoolSize="524288" maxReceivedMessageSize="2147483647"

)

Check Below URL(This is Error):

http://forums.asp.net/t/2033804.aspx?The+open+operation+did+not+complete+within+the+allotted+timeout+error+in+WCF+dual+binding[^]

Give me any suggestion .?