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• 15:56, 5 March 2026 Admin talk contribs created page Re-INVITE UDP fragmentation (Created page with "'''Problem'''<br> The client sends SIP re-INVITEs over UDP that exceed the standard MTU (e.g. 1529 bytes > 1500 bytes). The re-INVITE is fragmented at the IP layer. On your side, re-INVITEs do not appear in traces; the client receives no response, and the call ends. Initial INVITE is within MTU and works; only the larger re-INVITE is affected. <br> '''Root cause'''<br> Fragmented UDP packets are dropped by your NAT/firewall (or possibly by the server interface). Only...")