Hi,
The phone is to be located external to our building at the entrance to a delivery yard, the drivers pull up lift the receiver and should be automaitcally put through to a delivery office(it's actually 2 offices located in different parts of the site) who then let them in.
It's on an sx2000.
My knowledge of phone systems is pretty poor, Im from IT support and have taken over from the role with only 9 days handover\training