SIP & SDP Parser
Paste an INVITE or a 200 OK out of a carrier trace or a pcap export. Expands the compact header forms, orders the Via chain, and turns the m= and a=rtpmap lines into a readable codec list. Runs entirely in your browser — traces are not uploaded.
Dialog
What identifies this call leg.
Via chain
Top to bottom is the path back to the sender. A response follows this in reverse.
A received parameter means the sender's Via address did not match the packet's source — it is behind NAT, and the responder corrected it.
SDP
The media offer or answer carried in the body.
No rtpmap attributes — payload types are static (RFC 3551).
All headers
Compact forms expanded to their full names.
That does not look like a SIP message. The first line should be a request (INVITE sip:… SIP/2.0) or a status line (SIP/2.0 200 OK).