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What firewall settings and security precautions should be configured to allow stable and secure VoIP traffic?
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Ensure SIP signaling ports (typically 5060/5061) and RTP media port ranges (10000-20000) are open and correctly forwarded.
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Only whitelist IPs from verified providers, and block traffic from unknown IPs to avoid unauthorized call attempts.
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Implement intrusion prevention systems like Fail2Ban, Snort, or Suricata to detect brute-force and SIP flood attacks.
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Use session border controllers (SBCs) to manage SIP sessions securely and to maintain call quality across NAT/firewall boundaries.
What firewall settings and security precautions should be configured to allow stable
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