We are currently testing AXON PBX for a software VoIP solution for up to 60-90 PCs/VoIP Clients.
When using AXON we found that it works perfectly when only 1 call is active, no distortion and only a fraction of a second delay (expected). But, when we have 2 active phone calls we start to notice a 1-1.5 second delay and quality starts to deteriate. With 3 active phone calls the delay stretches to 3-5 seconds and quality crumbles to nearly the point its hard to understand what the other side is saying.
The environments we have been testing in are as follow: