I’ve noticed a significant difference between SIP and IAX when doing an Echo test to my home Asterisk box from outside. SIP is much more responsive. I’ve tested with several different soft phone clients and the results are always the same.
Why is this? Is it because IAX’s use of just one port slows communications down? I was such a proponent of IAX but now I wonder if the SIP/NAT headaches are more than made up for by SIP’s significantly better performance.
Has anybody else noticed this difference? Can somebdoy corroborate my results with their onw tests?