OBi1032 Voice Quality Lower than OBi202
Charlemagne:
I appreciate that additional information. I actually temporarily achieved a 4.44 with a G.711u codec on my OBi202. It then fell to 4.42. Both sounded great even with the analog phone. The maximum I've obtained with the OBi1032 is a temporary 4.34.
What you've outlined seems like a sound procedure to follow. That is the way I'll do it.
Thank you again.
SteveInWA:
Quote from: Charlemagne on September 01, 2018, 10:58:10 pm
I appreciate that additional information. I actually temporarily achieved a 4.44 with a G.711u codec on my OBi202. It then fell to 4.42. Both sounded great even with the analog phone. The maximum I've obtained with the OBi1032 is a temporary 4.34.
What you've outlined seems like a sound procedure to follow. That is the way I'll do it.
Thank you again.
Wait -- do you really think that 4.42, 4.44 and 4.34 are significantly different? That's just a variation within the degree of accuracy of the measurement, which is subjective to begin with. I wouldn't even look at the hundredths digit. Remember, the OBi device is making an arbitrary calculation of a measurement that was originally defined as the subjective opinion of a bunch of human listeners. Tiny and normal variations in jitter and packet loss are perfectly normal, unless you were using a private, managed IP network, end-to-end, which you are not doing. Each of your calls may take a different path over the messy public internet.
No human being could hear the difference between calls with those numbers. They'd say "hmm, they all sound good to me." So: don't worry about the MOS score, as long as it consistently stays in that very good range. The only thing that matters is how it sounds to the people on the phone.
If you are curious to explore the VoIP call quality capability of your own Internet service, and the many points between you and somewhere else, then use Visualware's test software: http://vac.visualware.com/
Charlemagne:
Yes, I agree with all of your points. The average 1032 MOS/G.711u is 3.50 - 3.75.
I included the maximum achieved MOS/G.711u score of 4.34 (albeit a very fleeting one) as a contrast to that of the once perfect 202 score at 4.44 (but more typically floating around maybe 4.37). The point I was trying to make is that on the same LAN, connection, switch. etc. the 202 performs consistenly better than the 1032, even though the latter is the more sophisticated of the two. As you point out, MOS should not be the determinating factor, and has not been in my evaluations. I've found that my perceiption of call quality corresponds more to the rate of lost packets (which is ironically always materially lower on the 202). Generally, MOS and Packet Loss Rate levels appear to be in rough parallel.
I too like the Visualware tests.
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