Interfaces in place of a Panasonic KX-T30865 or KX-T7775 doorphone Allows use of these Viking entry phones: E-10A Flush mount speaker phone E-20B Surface mount speaker phone E-30 Stainless steel speaker phone E-32 Stainless steel double gang box mount E-35 Stainless steel video speaker phone E-40 Compact door entry phone E-50 Compact video door entry phone E-60 Double gang entry phone E-65 Double gang video entry phone E-70 Double gang entry phone with built in prox card reader E-75 Double gang video entry phone with built in prox card reader All Panasonic doorphone / door station card programming options and features may still be used Increased audio performance over Panasonic’s doorphones Provides adjustable ringback tones to entry phone Provides CPC signal to entry phone