When software-defined networking (SDN) and network functions virtualization (NFV) became an item and created a virtualization dream team for the telecom operator community, the future looked bright.

Together, these two critical and market-changing developments fueled telecom operator dreams of operational and capital efficiencies, new service generation and revenue opportunities and an end to vendor lock-in.

This was the telco cloud, but it looked like it was going to have one hell of a silver lining.

Yet here we are in late 2016 and, well, the virtualization weather chart has a few more low-pressure areas than everyone hoped for. SDN as we know it has been with us for about six years now, and NFV just had its fourth birthday. But with maturity comes a set of challenges, though fortunately not insurmountable ones.

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