Some measured delays

Actual performance of SIP phone to SIP phone and software applications over a LAN, shows that the performance of SIP phones is well within acceptable delay.

Measurements of mouth to ear one-way delay, from “Aside: SIP phone QoS” slide 15 of [Schulzrinne 2003]
end-point A	end-point B	A→B	B→A
GSM	PSTN	115 ms	109 ms
3Com	Cisco	51 ms	63 ms
NetMeeting	NetMeeting	401 ms	421 ms
Messanger XP	Messanger XP	109 ms	120 ms

Slide Notes

Henning Schulzrinne, “SIP - growing up”, SIP 2003, Keynote speech at SIP 2003, Paris, France, January 2003, http://www.cs.columbia.edu/~hgs/papers/2003/SIP2003-keynote.ppt Links to an external site.

Transcript

[slide464] If we look at the measured delays between different pairs of things, we see that, and this is from early measurements by Schulzrinne in 2003, sort of fairly high delays, particularly for things like NetMeeting early on.