Visitor Location Register (VLR) is a database which stores information about mobile phones that have recently joined a particular area of a mobile operator’s network. It plays a vital role in keeping track of roamed mobile phone subscribers and co-ordinates with the HLR to determine whether the mobile is a permanent subscriber or a temporary one. Whenever a Mobile Switch Center (MSC) detects a new mobile in its network, in addition to creating a new record in the VLR, it also updates the HLR of the mobile subscriber, apprising it of the new location of that mobile (the MSC address). The MSC address received during an HLR lookup for a particular mobile number is useful for identifying numbers roaming in another country. The foreign network that the number is logged onto can also be identified using this data.
A Virtual Private Network extends a private network across a public network and enables users to send and receive data across shared or public networks as if their computing devices were directly connected to the private network.
Wireless Application Protocol - This is a secure specification that allows users to access information instantly via handheld wireless devices such as mobile phones, pagers, two-way radios, smartphones and communicators.
Webhooks are custom callbacks (automated messages) sent from a web page or app when they a triggered by an event, such as, receiving a phone call or an incoming SMS, and provide a method for augmenting or altering the behaviour of the web page or app. They contain a message or payload and are sent to a unique URL, essentially the app's phone number or address. Callbacks may be maintained, modified, and managed by third-party users and developers who may not necessarily be affiliated with the originating website or application.
Extensible Markup Language - This is a standard for creating markup languages which describe the structure of data. It is not a fixed set of elements like HTML, but rather, it is like SGML (Standard Generalized Markup Language) in that it is a meta-language, or a language for describing languages. XML enables authors to define their own tags. XML is a formal specification of the World Wide Web Consortium.
For Sinch, Zero-Trust is in reference to our API platform, or Zero-Trust API Platform (ZAP).
The "Zero-Trust" part of ZAP comes from zero trust security models. It refers to the fact that no data should be implicitly trusted and should always be authorized on behalf of some authenticated identity.