anchor.diff:  
   
       ?assertReceiveNot("Message queue is empty", _),
  -    unregister(?MODULE),
  +    unregister(?REGNAME),
       ok.
   
   
  
positive.code: %% - 5xx response is received
  %% - transaction terminates
  client_invite_err(Transport)->
      register(?MODULE, self()),
  
      Remote = sip_test:endpoint(Transport),
      Request = sip_test:invite(Transport),
  
negative.code:             ok % we have lots of message retransmissions in message queue
      end,
  
      unregister(?REGNAME),
      ok.
  
  %% Scenario tested:
  