A few of us ran some tests at work and “unplugging the USB” is our equivalent of the PC crashing.
Below are some of the tests we did with the results:
- Call from Lync; answer on Lync. Transfer call to Polycom. Unplug USB and call drops.
- Call from Polycom; answer on Lync. Unplug USB and call stays up
- Call from Lync; answer on Polycom; Unplug USB and call stays up
With Polycom set as default audio device in Lync
4. Call from Lync; answer on Polycom; disconnect USB and call stays up
5. Transfer call #4 to “PC Mic and Speakers” then transfer it back to Polycom; Unplug USB and call drops.
So it appears in #5 that answering on the Polycom will not always keep you alive in the event of a PC issue. In our testing, what happened when transferring the call from the Polycom to the Lync client is that Lync set up a new phone call and didn’t just redirect the audio stream.
So, in general, if you initiate all of your calls on a Polycom CX600, then what your PC does is irelevant.