Signaling Compression (SIGCOMP)
Signaling Compression (SigComp), a solution for compressing messages generated by application protocols such as the Session Initiation Protocol (SIP) (RFC 3261) and the Real Time Streaming Protocol (RTSP) (RFC 2326).
Typically, SigComp uses the same transport protocol as the protocol being compressed.
XXX - Add example decoded traffic for this protocol here (as plain text or Wireshark screenshot).
The SIGCOMP dissector is fully functional, and can display the uploded UDVM code and decompress messages if the messages containing the UDVM code is seen. The following libraries are included:
Reassembly of segmented TCP packages is implemented.
Example capture file
A complete list of SigComp display filter fields can be found in the display filter reference
Show only the SigComp based traffic:
You cannot directly filter SigComp traffic while capturing. However, if you know the port used (see above), you can filter on that one.
Capture only the SigComp traffic over the default SIP UDP port (5060):
udp port 5060