Can’t unlock front door to apartment complex with keypad on Iphone 5s

[speclap3m]

Apartment using MIrcom intecom system TX3. The intercom systems rings my IPhone 5s, but when I press 9 to unlock front door nothing happens.

Any ideas? 

[Cawtau]

Hello Speclap3m,

  I replied to your other post here.

Hope this helps 😀

Cheers