How do I support call transfer when a session has already been started.
 
The scenario is like this
 
A         ---------------->         B
               invite
 
A         <---------------            B
              180 
 
A         <---------------            B
              200
 
_________________________
 
    Media has started
 
Now B has to  to transfer the call to C so that the media between A and B is terminated and the media is started between A and C.
The point is B has to make the transfer.
 
How is this possible using the SIP protocol.
 
 

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