stateful

  1. Firewall port closed - RTP still flowing

    Hello, Let's assume the following simple setup: Internal 3cx (RTP port 9000) - - - > Firewall - - > Internet - - > Provider (RTP port 10000) The internal 3cx has a SIP trunk with the provider and UDP port 5060 is open on the local Firewall, so SIP negotiation is OK. However, RTP port 9000 is...
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