I have 2 Soundpoint IP 301's and I can hear the other party, weather another extension for external caller, but I can not speak to that extension. I tried the hardware test and I can not hear my recordings, But it just does not make sense that I have the same issue with both phones.
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I have tested each phone using the hardware test on the phone itself to remove the server from the equation and neither handset works. No other polycom phones in my network. and my phones have half-deuplex speakerphones so I can not test that.