I use both Lannouncer and BigTalker and am unaware of these apps supporting keypad functions.
I’m guessing you may be using @tgauchat ActionTiles with the security pin function for your keypad. If not please define what you are using for the “keypad”.
You may have multiple tablets / smartphones set up with ActionTiles and they will all function as “keypads”. However, ActionTiles currently supports a single pin number.
Should you want multiple pins or need entry and exit delays, you may use one or more Iris or Centralite Keypads with my SHM Delay smartapp.