I need to decode RTP Multiplex streams using wireshark. Presently we can decode only Non -Multiplexed RTP streams in wireshark.
A multiplexed voice packet is composed by concatenating
RTP encapsulated voice packets and IP and UDP headers.
Below is the
Multiplex Packet format
|
IP
|
UDP
|
Multiplex Header
|
Compressed RTP Header
|
RTP Payload
|
Multiplex Header
|
Compressed RTP Header
|
RTP Payload
|
This Multiplex header is repeated in beginning of each RTP packet.
So I was thinking of way to extract this multiplex header & use it to
decode each RTP packet following this Multiplex header.
I supose we need to make a dissector
packet-rtpmultiplex.c regestring to a UDP port as a starting point.
Dissect the multiplex header, decompress the rtp
header and have the RTP dissector dissecting
the resulting "RTP packet" -
decompressed header+data.
Could you help me in dissecting the multiplex
header and make this work.
Also I need to know the steps to write our own filters in wireshark
It would be great help. Kindly reply as soon as possible
Regards
Shruti
