Door Entry System

Could not see an appropriate forum for this question so posting here,

An existing door entry system is shown in these two pictures:
http://cyberpictures.net/mph/doorentrysystem.png
http://cyberpictures.net/mph/entrypush.png

Does anyone recognise who the manufacturer is and maybe a link to an URL where such items can be purchased?

I would like to add an additional station to that setup. What would I need?

With thanks in advance of any help forthcomming.

Have you tried google image search?

The handset is a BPT Lynea, though the controller model number is the relevant one in determining whether you can add another unit.