electronics line

Has anybody got an idea of which modern door intercom phone system can be replaced with this old rocket i have in my house when ever it rings, it sounds like an old electrical transformer which is exactly what it is inside it, Have pictures of it below. Thanks guys.

I've moved into a house with the old EL Infinite system (i.e. not the newer Prime models). The previous owners have given us the Master Code but not the Installer Code. I want to run diagnostics to see what modules are installed (e.g. if there is no GSM module then I intend to install one...