Hi Oleg,
Yes you can get useful data with tshark (example output below).
Here is how you used it: tshark -B 2 -o rtp.heuristic_rtp:TRUE -qz rtp,streams
========================= RTP Streams ========================
Src IP addr Port Dest IP addr Port SSRC Payload Pkts Lost Max Delta(ms) Max Jitter(ms) Mean Jitter(ms) Problems?
192.168.243.10 20384 192.168.243.250 27970 0x6041871C ITU-T G.711 PCMA 227 0 (0.0%) 20.30 0.12 0.08
192.168.243.10 20022 192.168.243.250 29280 0x80D44306 ITU-T G.711 PCMA 227 0 (0.0%) 20.31 0.06 0.03
Cheers,
Michael