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Session Initiation Protocol. or SIP, is an application layer communications protocol that can be used in conjunction with other protocols for voice communications over IP or video calling.

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that the conn tracker is seeing the packets as part of a related session, and allowing the packet through. The server then responds (usually a SIP INVALID response), and this sends it into ASSURED … state. Technically the related portion is only supposed to be invoked by a connection tracker helper (like the SIP ALG helper); I don't have that kernel module loaded, so maybe I'm slightly off and it's …
answered Sep 23 '18 by lidocaineus