The DS-SIP is an indoor control module that can be used with the Natcomm DP2 door phone. It provides Ethernet IP connectivity using an highly-configurable internal SIP engine (ATA) and acts as an extension.
The unit will hot-dial a number and then route the call to one or more phones when the door phone call button is pressed. After answering the call, the keypad of a connected phone can be used to allow gate or door entry by operating two relays contact within the DS-SIP.