In making calls outbound through various VoIP origination providers
people on the PSTN network have been complaining of poor voice quality.
Diagnosing has been difficult with limited feedback but I tried using
different originators and seem to have the same problem. I used
TestYourVoip.com and generally get a 4.4/5.0 MOS score with no packet
loss but the echoed voice I hear back is definitely poor. I'm trying to
figure out how to go about diagnosing it or at least understanding some
common sources of this type of problem.
Some details:
I am using IAX with ulaw.
I've tried with more than one originator.
It doesn't appear to be a problem for inbound calls.
MARK.
