I'm currently testing an SPA8000 and I have background high pitch noise problemwith a GE analog phone when on speaker phone. The phone is directly connected to the SPA8000 with a 6 feet phone cable. I've tried the same phone on other units (Audiocode & Mediatrix) and I don't see the problem. I'm wondering if this is related to the load on the FXS channel. I saw on another forum that some unit have this problem and must be return for RMA. Anyone experienced the same situation? We might buy a lot of those if this is not too big of an issue.
Thanks for your feedback