I've been in contact with support for a long while. So far, nothing is helping. I already did UDP port forwarding range 5004-65000 to 192.168.222.179 which is grandstream box internal IP. I left it alone until we fix the issue. Still the same issue. Most of the time, the outgoing calls dialed out no problem and I can stay on for HOURS without being disconnected. But some certain number will not dial out at all that I had to use my cell to call. If I use a different number while cannot dial that certain number, it will dial out no problem. It rings once, then nothing. Sometimes the party would tell/ask me if I called them earlier because they answered and it was dead air.
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