Just wondered if anyone has tried the ESI dPhone 4 digital on ESI 50? Just curious if the call quality is better than 60D?

same as the 60d....on a Good day.

We haven't had any call quality issues with the 60 or dPhone4.
Only complaint we've had with the dPhone4 is that it goes to sleep and then you cant see the DSS keys.

Can I install a esi dphone4 on a esi 50?

as long as software on system is at least 11.5.55.37 (the only way to check it is with Installers pw)