Guys, this quality problem has eluded me for some time now. I have several servers which have both PSTN & IAX accounts with VoIP providers and also have IAX trunks between them. We have pfsense doing QoS (at two sites at least) and I can validate calls are going through the purpose-built VoIP queues - obviously most importantly for outbound.
Now here is the problem. Server A (IAX) <-> Server B (IAX) - flawless Server A/B (IAX) <-> VoIP carrier (IAX) - often have dropouts and many complaints At first I started to think about IAX and how it was being handled by ISP routers etc. but if it weren't up to snuff it would negatively impact my server-server communication too. These issues have been seen with two different VoIP carriers. Opinions/experiences? - dbc.
