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As for Radcom, as I understand it AT&T is using their MaveriQ vProbes but these are feeding ECOMP/ONAP's own in-built monitoring/assurance solution.
http://www.lightreading.com/nfv/radcom-snags-atandt-in-vnf-win/d/d-id/725213
There is a distinction in the service assurance industry between probe vendors and the software systems that sit on top (fault management, root cause analysis, performance management). I have no view on the RADCOM share price but my understanding is the software systems are the more interesting businesses to own than the probe vendors.