DTIS inherited many ISDN capabilities (Caller/Called Line Identification, Multiple Subscriber Number, High-speed data communication, etc) and some new capabilities (SMS/MMS/Rich Messaging-like text messaging system, more faster connection set-up time, improved security and privacy (using DES and AES), ONAD (One Number, All Device), and etc). DTIS also capable to be transporter and be transported for/by Ethernet, IPv4/IPv6, TCP/UDP, and others.
DTIS define interface reference area into 3 zone:
NNI (Network to Network Interface)
This interface area defined as interconnection interface between DTIS exchange/PBX system. This area are under provider/administrator control.
UNI (User to Network Interface, from subscriber view) or NUI (Network to User Interface, from DTIS exchange/PBX view)
This interface, also known as "The middle area", defined as interconnection interface, bridging NNI and UUI area, starting from Subscriber Connection Module (in DTIS exchange) to master device with Terminal Register and Controller (like PBX systems, DTIS telephone, etc), with DNTC (DTIS Network Termination Controller, DTIS iNID unit) in subscriber premises act as demarcation point and provide local network control, service management, and as testing system for network and user side. This interface fall under joint subscriber/provider control.
UUI (User to User Interface)
UUI are defined as an interconnection interface between all DTIS terminal device whom connected into master device/DNTC, directly and indirectly, in that premise.