Scope
This document will help you determine which VOIP phone is ideal for your needs. Both Door Entry phones do allow to be connected to a Door Strike, Mag Lock, Gate Controller, etc via COMMON and NORMALLY OPEN contact to operate the strike.
Items Needed
Door Strike, Mag Lock, Gate Controller (Optionally)
Door Entry Phone with No Keypad (VIKING E-20-IP VOIP ENTRY PHONE)
You will want to use this device if the client wishes the visitor to click a button to call a group of extensions.
This also means their employees have another way to enter the door without calling in using the device (such as a Key, Key Card, or Fob)
Door Entry Phone with Keypad (VIKING K-1700-IP VOIP ENTRY PHONE)
You will want to use this device if the client wishes the visitor to click a button to call a group of extensions and also allow their employees to buzz in themselves without a key.