We have used Grandstream , for long time, we are experiencing isue with HT801, for the last 3 month, the new HT801 that we install, once a day , they are blocked, you have ping from router but you are not able to acces to it by local, and form wan,
We have update the last firmware, and the same, we have changed some of them by olt ciscos, and HT701. and they have no problems.
We have changed 50 by the way ,thinking of changing brand (sorry for the comment) but we have spend a lot of time in going to costumers
Anyone have experienced this issue?