I have seen a packet capture of this happening, and did see something to this effect, so yeah, i believe it. Honestly, the solution to this (and the 10000 other problems involving grandstream/yealink/whatever is to stop using, selling, and recommending anyone use them. You will continue to have problems, there will continue to be close to or zero support from the manufacturer, and the model you're using will be EOL'ed faster than literally any other brand out there. At this point, there are seriously competitively priced options from all the reputable manufacturers. The best part, of course, is that they will work and the manufacturer will support them. How neat is that?
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