have VVX 410's and VVX300's all on 5.5.2.8571. have tried both plantronics and sennheiser headsets and all do the same thing. tested on 2 different cable internet connections and a fiber optic connection and used 2 different routers on each internet...same thing. also tried backdating to a few older firmware versions and it's still happens.
whether I call or someone calls me, that person hears what they are saying (echo) repeated back to them as they speak. they sound normal to me on my end on the polycom's and I don't have an echo when I speak on the polycoms. If I pick up the handset or push the speakerphone buttons the echo goes away immediately on their end...put them back on the headset and the echo comes right back. it happens if the other person is on a cell or a landline.
im basically having the same issue this post is having:
http://community.polycom.com/t5/VoIP/Headset-Echo-Issue-with-VVX-300/m-p/93355/highlight/true#M21471
searching the faq, I found this:
my headsets are on the compatible list but no where in there or the main FAQ can I find what to do to fix this issue.
anyway I have to have working headsets. hoping someone has some other things I can try to get them working on my polycoms. I tested the headsets at a friends office that has another brand of phones and they worked fine...I really dont want to start replacing all these phones. TIA