Introduction One of the more stubborn SIP interop problems in modern networks is reliable provisional response handling, especially when bridging classic SIP deployments with IMS-oriented environments. In IMS-heavy networks, RFC 3262 support is often assumed. That means 100rel, RSeq, RAck and PRACK are not optional extras anymore, but part of normal call establishment. On the … Continue reading SIP PRACK/UPDATE Interworking Support in OpenSIPS 4.0
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