The best replacement for tandberg is polycom.

The best alternatives to tandberg are rated as following:
★★★★★  polycom
★★★★  lifesize
★  radvision
★  telepresence

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Speaking about tandberg, one probably shouldn't forget about call manager.

Other search terms related to tandberg and their ratings are:
★★★★★ call manager
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Google Trends

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tandberg
polycom
lifesize