In a Skype for Business Server 2015 environment, you successfully make a telephone call with another Skype for Business user by using your mobile phone on mobile cellular network. Then you open the details of this session in the User Activity report. You may notice that the caller connection type is displayed as Tunnel (VPN) instead of MobileBB (Mobile Broadband) in the QoE Call Detail SubReport (which is a part of Media Quality report).
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