Trigger event and Lock down a phone (probably T19P)

[Chris M]

We’re looking at putting some Yealink phones into a Motel (just for their office phones) shortly. At present (on the old PABX) they have a phone on the wall outside the office so that if a customer picks that phone up it automatically calls the other extensions (thus if the office is unattended or after hours it will call their cordless phones and they can come to Reception). We would need to replace this phone also and obviously could just put in the most basic phone (say a SIP-T19P) to be mounted on the wall.

Is it possible for us to retain the same functionality – i.e. it would need to:
a) trigger an event (to call the other extensions) when someone picks up the hand piece.
b) we would need to lock down the phone so people can’t do anything else with it (i.e. don’t want them to be able to call any other numbers and don’t want them to be able to access the setup).

Any assistance greatly appreciated, thanks