May 14 2020 09:56 AM - edited May 14 2020 09:59 AM
Teams call latency is waaaay better than we were getting with our previous VOIP provider (Mitel) but I still felt it was a bit worse than PSTN->PSTN calling. I grabbed an audio recorder and audio editing software and did some testing to see what the actual mouth to ear latency was.
PSTN (Bell Canada Cell Network) to Windows (Teams): 450ms
Windows (Teams) to PSTN (Bell Canada Cell Network): 630ms
Total round trip: 1080ms
For reference, the general accepted round trip latency limit for decent call quality is 300ms ( https://www.lifewire.com/what-is-latency-and-how-it-can-be-reduced-3426314, https://getvoip.com/blog/2018/12/20/acceptable-jitter-latency/ )
1080ms leaves something to be desired. It's workable but I still find parties interrupting each other on calls fairly often. I didn't test PSTN->PSTN but I'm sure it will be much lower.
For reference, my Windows desktop is on a gigabit fiber internet connection with 4ms latency to Google DNS servers. At the time of testing there was very little utilization of my internet link or the compute resources of my fairly modern Windows desktop.
I'm curious as to how much the recent surge in Teams demand is a factor here and how much of this latency is base system latency. Has anyone else done measurements like these?
Sep 17 2020 12:58 PM