VOIP Quality Test results:
Phone Power:
Jitter 43.8 ms - too unpredictable.
All else good (download, upload, packet loss, MOS score)
voipqualitytest.com:
Jitter 126.8 ms - too unpredictable
Consistency of Service 18% - unable to produce constant stream of data (poor voice quality)
All else good (packet loss, MOS score, etc)
Both tests showed a shockingly low download speed, though good enough for VOIP, and upload speeds were lower than expected as well, though again, good enough for VOIP. The download speeds were nowhere near the results I get when I run various other speed tests. Don't know what that means, though apparently it is unimportant to the problem at hand.
So, my jitter is bad, as is consistency of service. Are these problems caused by my ISP? Modem? OBi? The magnetosphere? IOW, whats my next step?
BTW, thanks to all who have taken the time to help.