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Sonetel Client under the NAT

I'm using Sonetel Clients in our company under the NAT, calls to/from DID number is ok, but calls betwen users by the extension number or internal contact number doesn't work.
What ports and protocols I should forward on the router/firewall?


  • I got the same problem and I am still looking for a solution - External calls work well but internal calls between extensions doesn't.

    The only way I was able to talk between extensions is configuring the phones with specific ports (not random), and redirecting them accordingly in my router, but this is not recommended by Grandstream and some lines begin to fail on external calls.

    I am still trying to have Grandstream answering about the range of ports each model use in order to determine the right assignation in the router.
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