Active Directory Diagrams

This IVR diagram sample illustrates how ENUM works by giving an example: Subscriber A sets out to call Subscriber B:
1. The User Agent of an ENUM-enabled subscriber terminal device, or a PBX, or a Gateway, translates the request for the number +34 98 765 4321 in accordance with the rule described in RFC 3761 into the ENUM domain 1.2.3.4.5.6.7.8.9.4.3.e164.arpa.
2. A request is sent to the Domain Name System (DNS) asking it to look up the ENUM domain 1.2.3.4.5.6.7.8.9.4.3.e164.arpa.
3. The query returns a result in the form of so called Naming Authority Pointer Resource NAPTR records, as per RFC 3403. In the example above, the response is an address that can be reached in the Internet using the VoIP protocol, SIP per RFC 3261.
4. The terminal application now sets up a communication link, and the call is routed via the Internet.
This IVR diagram sample was designed on the base of the Wikimedia Commons file: Ejemplo ENUM.jpg. [commons.wikimedia.org/ wiki/ File:Ejemplo_ ENUM.jpg]
"Being able to dial telephone numbers the way customers have come to expect is considered crucial for the convergence of classic telephone service (PSTN) and Internet telephony (Voice over IP, VoIP), and for the development of new IP multimedia services. The problem of a single universal personal identifier for multiple communication services can be solved with different approaches. One simple approach is the Electronic Number Mapping System (ENUM), developed by the IETF, using existing E.164 telephone numbers, protocols and infrastructure to indirectly access different services available under a single personal identifier. ENUM also permits connecting the IP world to the telephone system in a seamless manner." [Telephone number mapping. Wikipedia]
The IVR diagram example "Example ENUM" was designed using ConceptDraw PRO diagramming and vector drawing software extended with the Interactive Voice Response Diagrams solution from the Computer and Networks area of ConceptDraw Solution Park.

This Venn diagram sample shows the system engineering at the intersection of enginnering, management, and application domain expertise. It was designed on the base of the Venn diagram on the webpage "Intelligent Transportation Systems (ITS) ePrimer, Module 2: Systems Engineering" from the website of the Office of the Assistant Secretary for Research and Technology (OST-R), the U.S. Department of Transportation (US DOT).
"The term interdisciplinary is a fundamental concept in systems engineering. To successfully develop a system requires the application of basic engineering discipline, management discipline, and expertise in the application domain of the system. In the case of ITS, that application domain is transportation engineering. The intersection of these disciplines is the realm of systems engineering."
[pcb.its.dot.gov/ eprimer/ module2.aspx]
The Venn diagram example "Systems engineering improvement" was created using the ConceptDraw PRO diagramming and vector drawing software extended with the Venn Diagrams solution from the area "What is a Diagram" of ConceptDraw Solution Park.