Symptoms
When you have a Microsoft Skype for Business conference call ongoing in a Microsoft Skype for Business Server 2015 environment, participants in the conference call occasionally hear the following Group Virtual Assistant (GVA) announcement:
sorry, I didn't get that...
Cause
The GVA announcement is triggered by external audio sources that sound like a dual tone multi-frequency (DTMF) tone.
Note The external audio sources that are identified are as follows:
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A Windows notification sound that's confirmed to technically resemble the audio wave of the * DTMF tone.
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DTMF tones that are played by other phones in speaker mode nearby an audio device that's connected to a meeting.
Resolution
To fix this issue, install the May 2017 cumulative update 6.0.9319.281 for Skype for Business Server 2015, Conferencing Announcement.