Hi, All. In Ethereal V0.99, /Statistics/RTP/Show All Streams, The case that the said value is abnormaly large is found.
For Example, VoIP 20ms G.711; RTP Time Stamp = 2^32-1(FFFFFFFF) at Seq1 and RTP Time Stamp = 159 at Seq2 RTP Time Stamp = 319 at Seq3 foliows +160 by Seq. In this case, Jitter Value is shown as about 10^6 msec in /Statistics/RTP/Show All Streams. It seems that Ethereal calculate the Jitter Value as follows; Delta between Seq1 and Seq2 : 159-(2^32-1) = |-(2^32-160)| However, TimeStamp means + Signed Time Unit, therefore, the calculation may be better as follows; Delta between Seq1 and Seq2 : 159-(2^32-1) = -(2^32-160) = +2^32 -(2^32-160) = 160 = In other words, In case of Timestamp(Seq=N+1) - Timestamp(N) <0 It is necessary to Normalize Delta by adding 2^32. Bset Redards _______________________________________________ Wireshark-users mailing list Wireshark-users@wireshark.org http://www.wireshark.org/mailman/listinfo/wireshark-users