anchor.diff:  -record(state, {
       app_id :: nksip:app_id(),
       module :: atom(),
  +    base_time :: pos_integer(),     % For outbound support
       pings :: [#sipreg{}],
       regs :: [#sipreg{}]
   }).
  
positive.code:     ok :: boolean(),
      last :: nksip_lib:timestamp(),
      interval :: non_neg_integer(),
      checking :: boolean(),
      from :: any()
  }).
  
  
negative.code:         ok = undefined,
          last = 0,
          interval = Time,
          user_internal = Time,
          checking = false,
          from = From
      },
  