Protocol scope and method
Paste one request or response start line per row. The checker recognizes common registration challenge and media setup sequences, not transaction timing.
Normalize start lines → classify request/response → compare common sequence patterns.
Common questions
Does the GB/T 28181 SIP Flow Checker leave my browser?
No application upload is used. Avoid putting sensitive production data in shareable URLs.
Is this a standards compliance test?
No. Confirm the edition and vendor profile with licensed documents and your target platform.
Offline diagnostic aid. Verify fields, version and vendor extensions before production use.