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What are the different firewall types reported by STUN, and what do they mean?

April 26, 2017different firewall mean reported stun types

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What are the different firewall types reported by STUN, and what do they mean?

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OpenH323 and PWLib support the STUN protocol (see RFC 3489) for detecting and interoperating with NATs and firewalls. The STUN protocol can detect several different NAT and firewall configurations, but only some of these configurations support VoIP functions.