Hey all,
I’m quit new here.
We’ve just installed a GS UCM6301 in our hotel and (almost) everything runs just fine.
Seen a lot of youtube tutorials and google last days 
The only thing that wont work for so far is out remote extension (outside the hotel)
We’ve been using the option of grandstream remote connect.
The extensions is registerd on the uCM, incomming calls are no problem.
Outgoging calls dont have audio at all.
I’f opend UTP ports 5060/5061/8090 at both ends
Do you have any new tips to make it work?
Thnx for al your support so far!
Greetz
Erik