Month: August 2020

Public Warning Systems in Mobile Networks

Introduction Cell broadcast (CB) is a way to deliver a text message to large numbers of handsets over the cellular network. Its main use today is the delivery of Public Warning System (PWS) messages, also called CMAS, ETWS, Presidential Alerts, EU-Alerts, or other names in different parts of the world. The Legba Lab Kit supports PWS messages through standard signaling from a core network, or through file-based configuration and command line controls (not requiring a core network). This makes the Lab Kit an easy and inexpensive way to test with PWS messages, for handset testing, for testing emergency message content …

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Engineering 4 Change OpenBTS Presentation Mention!

Engineering for Change has mentioned our founder and CEO for Legba INC in their presentation on learning how to deploy mobile voice and data communication networks for remote communities. Kurtis Heimerl leads this E4C Webinar that highlights some of the projects that are possible with OpenBTS cellular networks. Then he showcases real world remote community deployments offering voice and SMS services! YateBTS, the successor to OpenBTS, is the basis for our GSM radio access network products, products that remain relevant in the current era of CSFB. For more information on these products, see the YateBTS web site, or send an …

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CSFB with the Legba Lab Kit

Introduction Many 4G networks cannot carry plain old telephone calls, so many mobile operators support voice calls by transferring the handset to a 2G or 3G network for the duration of the call. The procedure for doing this is called “Circuit-Switched Fallback”, or CSFB. CSFB is an interesting procedure from a network operation perspective and from a security perspective. With a pair of Legba LabKits, one in 2G mode and one in 4G mode, you can reproduce and modify the CSFB procedure on a test bench. The “Why” and “What” of Circuit-Switched Fallback Circuit-Switched? What is that anyway? Since 1876, …

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