On 11/14/06, Razor Ramone <[EMAIL PROTECTED]> wrote: > Hello, > > for my school project, I decided to analyze a VoIP call using wireshark but > there are some things that are not clear to me. > below, I am always talking about RTP packets > > first of all, in a conversation, I expect that the initiator and the > receiver take turns talking. Therefore, I expected to see that when the > initiator is sending packets (talking), the receiver is listening (not > sending packets), but that is not the case in my Wireshark captures. > What I see is that the receiver generally sends packets continuously at a > frequency of 1 packet every 20ms. > > On the other hand, the receiver is simultaneously sending packets in a > different pattern. The receiver sends 4 to 5 packets almost at instantly ( > 0.0x ms between each packet), then it waits 80 to 100ms during which it > receives 4 to 5 packets from the initiator, then it sends another burst of > 4-5 packets. > > So my questions so far are > -Why do initiator and receiver send packets simultaneously? may full-duplex be the answer?
> -Why do initiator send packets in different patterns? (20ms vs a burst of > packets followed by a wait) Buffering problems, network congestion, transport problems, etc... that should be seen on case per case basis. > > The answer to my first question, I suspect, would be noise, or synhetic > noise was introduced into the conversation on purpose (comfort noise) but I > am not sure about this. That can be. > > My final question is: > -If it is true that the reasons initiator and receiver send packets at the > same time, why, then, are there times that they do not send packets at the > same time? (in one conversation, the initiator is talking for an extensive > period of time during which the receiver sends no packets) may silence-suppression be the answer? > > _______________________________________________ > Wireshark-users mailing list > [email protected] > http://www.wireshark.org/mailman/listinfo/wireshark-users > > -- This information is top security. When you have read it, destroy yourself. -- Marshall McLuhan _______________________________________________ Wireshark-users mailing list [email protected] http://www.wireshark.org/mailman/listinfo/wireshark-users
