Voice over IP is widely seen as one of the next killer applications, integrating data and voice networks as well as applications. However, proprietary voice networks and components also offer good degree of separation and segmentation, increasing confidentiality, integrity and availability of telephony services versus data networks. When these two services are integrated (and in many places they are already), new threats arise and additional risks have to be mitigated. There is no doubt that also the PSTN has seen its share of attacks (war dialing, phreaking, fraud). Migration to VOIP on a large scale will see similar and new types of attacks to the combined infrastructure. It is recommended to separate the two networks logically (or even physically) and conduct an in-depth review of the threats to VOIP and implement effective countermeasures to ensure availability of voice services. The cost savings achieved by using VOIP will mostly be used to implement security.
Requegesis is the critical interpretation of requirements. It’s at the same time an art and methodical approach to understand history, origin, background (also cultural), criticality and validity of requirements. The goal of requegesis is to find the best functional response to requirements while taking liberty in their interpretation. The word “requegesis” itself is a portmanteau - a linguistic blend - of the two words “requirement” and “exegesis”. The first part of the word “requ” is used in the traditional sense of the " singular documented physical and functional need that a particular design, product or process must be able to perform ". The second part of the word exegesis (from the greek “to lead out”) is the “ critical explanation or interpretation of a text, particularly a religious text. “ I think exegesis with the connotation of being used for religious texts underlines the way some requirements being treated as sacrosanct rather than critically interpreted ...
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