I have an assortment of both Sangoma S500 and S505 phones.
My problem is as follows: most, but not all of my S500s are experiencing massive packet loss and horrible sound quality. They have packet loss over regular ping, and obviously over any VOIP communication. It’s so bad you can hear the problem during the dial tone. Audio is choppy, words are dropped etc.
My S505s are working flawlessly. I can take an S505 and plug it into the exact same port/wiring/etc in the same location and have crystal clear calls.
This is all across a LAN, no WAN links involved. Internal calls are affected as well as external calls across our POTS service, but the POTS lines sound fine on the S505s.
Does anyone have any idea what’s going on here?