anchor.diff:      2 = nksip_dialog:meta(invite_session_expires, Dialog1A),
       undefined = nksip_dialog:meta(invite_refresh, Dialog1A),
       2 = nksip_dialog:meta(invite_session_expires, Dialog1B),
  -    true = is_integer(nksip_dialog:meta(invite_refresh), Dialog1B),
  +    true = erlang:is_integer(nksip_dialog:meta(invite_refresh), Dialog1B),
   
       % Now both ua1 and ua2 has received a 422 response or a refresh request with MinSE,
       % so it will be used in new requests
  
positive.code:     1800 = nksip_dialog:meta(invite_session_expires, Dialog1A),
      undefined = nksip_dialog:meta(invite_refresh, Dialog1A),
      1800 = nksip_dialog:meta(invite_session_expires, Dialog1B),
      true = is_integer(nksip_dialog:meta(invite_refresh), Dialog1B),
  
  
      % Lower time to wait for timeout
  
negative.code:     {ok, 200, []} = nksip_uac:update(Dialog1A, [{session_expires, {2,uac}}]),
  
      90 = nksip_dialog:meta(invite_session_expires, Dialog1A),
      true = erlang:is_integer(nksip_dialog:meta(invite_refresh), Dialog1A),
      90 = nksip_dialog:meta(invite_session_expires, Dialog1B),
      undefined = nksip_dialog:meta(invite_refresh, Dialog1B),
  
  