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Hi Can someone please help with the following, We are using asterisk@home 1.5 and SIP trunks to communicate to the PSTN network. We are having some problems with the call quality. Although we can hear the other person's voice quite clear when making or receiving a call, we get complaints from the people on the other end saying that our voices sound very unclear, low and that the voice

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...

...the phone is connected to, and I've dropped the MTU to 576 as suggested for lower speed links. (1.5Mbs/384kbps in my case). Both these changes seemed to make an improvement over previous calls. Currently I don't believe the bulk of my problems to be between the phone and the * server. testyourvoip.com tests consistently show a 4.4 score (the maximum for ulaw) and rarely shows errors. Ulaw is the codec used for both the SIP calls and IAX trunk. What I'm looking for : ---------------------- I'm trying to determine the cause and location of the problem between my * server and the I...