A couple of years ago I posted about the problems I was having with severe packet loss and interface dropout I was having with my Grandstream GRP2612 VOIP phone connected to Hub 3.
The thread has been archived, but can be found with a search for Grandstream
I am pleased to report that the problem is now fixed. I can ping the phone every 0.1 seconds with no packet loss in 10000 packets. The phone display shows no network or interface errors.
I have no idea how it has been fixed but it is now working. I have installed several firmware upgrades to the phone and it is quite possible that the Hub 3 has been upgraded too in the last two years.
Please note that the original thread refers to model number GRP-1612 which is wrong.
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