[asterisk-users] End to End delay calculation

[capricorn 80]

 Hi !   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. 
Regards,

> Date: Sun, 22 Nov 2009 17:12:22 -0800
> From: asterisk.org at sedwards.com
> To: asterisk-users at lists.digium.com
> Subject: Re: [asterisk-users] End to End delay calculation
> 
> On Sun, 22 Nov 2009, capricorn 80 wrote:
> 
> > I am looking to calculate the end-to-end delay between two soft 
> > phone/hard phone. I have asterisk server and configured ntp server on 
> > the same machine and synchronized it with ntp pool.  I have seen that 
> > Wireshark can be used to check the jitter. But I am not sure how can i 
> > calculate the end to end. May be this is not related to the mailing list 
> > topic but please help me if anyone has some information.
> 
> A very long time ago, I made the mistake of letting a client listen (with 
> a handset on each side of his head) to end-to-end delay.
> 
> This all of a sudden became a quest for the Holy Grail to quantify and 
> reduce the delay.
> 
> I got a couple of RadioShack telephone recording interfaces, connected one 
> to each endpoint. Then I connected the outputs to the left and right 
> channels on a PC and recorded "tapping" on one of the handsets using 
> Audacity. When I selected the interval between the "tap" and the "ping," 
> Audacity would show the time in ms.
> 
> All very "old-school" but it worked and the client never questioned the 
> "pretty pictures" on the computer screen.
> 
> Wireshark may be able to tell you how long it takes a packet to travel 
> across your network, but what about the time from the network interface on 
> the host until sound comes out the earpiece? How long does it take a SIP 
> phone to take a packet off it's network interface, wiggle it through it's 
> jitter buffer, transcode it, convert it to analog and deliver it to the 
> earpiece?
> 
> -- 
> Thanks in advance,
> -------------------------------------------------------------------------
> Steve Edwards       sedwards at sedwards.com      Voice: +1-760-468-3867 PST
> Newline                                              Fax: +1-760-731-3000
> 
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