PBX Open Port and Port Forwarding in 2.3

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[itsnyc]

Port 5060 (UDP) for SIP communications (send & receive)

Port 3478 (UDP) for communication with the STUN server (send & receive)

Port 9000-9003 (or higher) (UDP) (send & receive)
RTP communications, which
contain the actual call. Each call requires 2 RTP ports, one to control to call and one
for the call data. Therefore, you must open twice as many ports as you wish to
support simultaneous calls via the VOIP provider. For example, if you want to allow
4 people to make calls via the VOIP provider simultaneously, you must open port
9000 to 9007