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Hi !<div> </div><div> Yea lot of things to look but what in case of sip phone to sip phone ? Is there anyway we can do it with some open source tool ? I have to do it for my experiment and I am really worried about it. </div><div><br></div><div>Regards,</div><div><br><br>> Date: Sun, 22 Nov 2009 17:12:22 -0800<br>> From: asterisk.org@sedwards.com<br>> To: asterisk-users@lists.digium.com<br>> Subject: Re: [asterisk-users] End to End delay calculation<br>> <br>> On Sun, 22 Nov 2009, capricorn 80 wrote:<br>> <br>> > I am looking to calculate the end-to-end delay between two soft <br>> > phone/hard phone. I have asterisk server and configured ntp server on <br>> > the same machine and synchronized it with ntp pool. I have seen that <br>> > Wireshark can be used to check the jitter. But I am not sure how can i <br>> > calculate the end to end. May be this is not related to the mailing list <br>> > topic but please help me if anyone has some information.<br>> <br>> A very long time ago, I made the mistake of letting a client listen (with <br>> a handset on each side of his head) to end-to-end delay.<br>> <br>> This all of a sudden became a quest for the Holy Grail to quantify and <br>> reduce the delay.<br>> <br>> I got a couple of RadioShack telephone recording interfaces, connected one <br>> to each endpoint. Then I connected the outputs to the left and right <br>> channels on a PC and recorded "tapping" on one of the handsets using <br>> Audacity. When I selected the interval between the "tap" and the "ping," <br>> Audacity would show the time in ms.<br>> <br>> All very "old-school" but it worked and the client never questioned the <br>> "pretty pictures" on the computer screen.<br>> <br>> Wireshark may be able to tell you how long it takes a packet to travel <br>> across your network, but what about the time from the network interface on <br>> the host until sound comes out the earpiece? How long does it take a SIP <br>> phone to take a packet off it's network interface, wiggle it through it's <br>> jitter buffer, transcode it, convert it to analog and deliver it to the <br>> earpiece?<br>> <br>> -- <br>> Thanks in advance,<br>> -------------------------------------------------------------------------<br>> Steve Edwards sedwards@sedwards.com Voice: +1-760-468-3867 PST<br>> Newline Fax: +1-760-731-3000<br>> <br>> _______________________________________________<br>> -- Bandwidth and Colocation Provided by http://www.api-digital.com --<br>> <br>> asterisk-users mailing list<br>> To UNSUBSCRIBE or update options visit:<br>> http://lists.digium.com/mailman/listinfo/asterisk-users<br></div> <br /><hr />Keep your friends updated— <a href='http://www.microsoft.com/middleeast/windows/windowslive/see-it-in-action/social-network-basics.aspx?ocid=PID23461::T:WLMTAGL:ON:WL:en-xm:SI_SB_5:092010' target='_new'>even when you’re not signed in.</a></body>
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