Once again, Thomas, there's a lot of interesting insight here to digest and ponder. I thank you for yet another thought-provoking VNI Mobile Forecast. Kudos to the Cisco team.

You said "Several global mobile carriers have recently launched or announced their intent to deliver voice-over-Wi-Fi (VoWi-Fi) services. Voice over Wi-Fi is not a new concept, but earlier solutions had limitations that inhibited broad adoption and sometimes delivered a less than optimal end-user experience."

Agreed, the technology is now vastly improved. In fact, take my own user experience as a case in point. The 4G cell connection from my Mobile SP provides sub-optimal voice communication quality in my home. But when using the Google Hangouts Dialer app on my smartphone to make calls via the Wi-Fi connection in my home, which is connected to my cable router, the voice quality is far superior. Granted, this isn't the SP VoWi-Fi use-case you referred to, it's another example of an application for the same basic technology.

Therefore, I'm wondering, in the future do you anticipate that more and more voice communication will appear as data traffic over the wireline network -- because it's not traversing the cell network as a narrowband call? And, if so, does it become more difficult to determine an accurate percentage increase/decrease of actual voice communication traffic across all networks?