- Joined
- Sep 3, 2010
- Messages
- 25
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- 0
i can't make calls or receive calls from an external ip. I have every port open in tcp and udp. the phone registers but it wont make the calls. this same phone works when on my internal network.
Founded in 2005, when VoIP was an emerging technology, 3CX has gone on to establish itself as a global leader in business communications.