parse_sip_message

dev.sipflow/sipflow · Verify this server

[cost: free (pure CPU, no network) | read-only, no persistence] Parse a single raw SIP message (request OR response) and return a structured view: start line (method/status), every header in order with line numbers, body, duplicate-header counts, and a list of structural flags the parser noticed (`missing-crlf`, `tag-on-pai`, `tag-on-ppi`, `invalid-folding`, `duplicate-single-instance`, `content-length-mismatch`). Use FIRST when the user pastes a single INVITE / 200 / NOTIFY and asks 'what does this look like to a parser?' or 'is this even valid?'. The output makes header-level bugs (two `From:` headers, `;tag=` on PAI/PPI, missing CRLF between headers, broken Identity folding) obvious without an LLM having to scan visually. Pair with: `lint_sip_request` for the full RFC compliance suite (request only); `diff_sip_messages` to compare two parsed messages structurally; `validate_stir_shaken_identity` if the message carries an Identity header.