anchor.diff:           server_invite_ok,
            server_invite_err,
            server_invite_timeout,
  +
  +         server_invite_cancel,
  +         %server_invite_ok_cancel,
  +         %server_invite_err_cancel,
   
            server_ok,
            server_ok_transport_err,
  
positive.code: 
      ?assertReceiveNot("Message queue is empty", _),
      ok.
  
negative.code: -export([client_ok/1, client_timeout_trying/1, client_timeout_proceeding/1]).
  -export([server_invite_ok/1, server_invite_err/1, server_invite_timeout/1]).
  -export([server_ok/1, server_ok_transport_err/1, server_err/1]).
  -export([server_invite_cancel/1]).
  -export([server_loop/1]).
  
  
  