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I don't know. But it happened to us as well. We found a fudge workaround. Every time it happens, we hit the numbers, which tweet loudly and seem to reset the system, allowing voice again.
Sorry, there was a problem. Please try again later.Hi, David! Please make sure that MUTE is not flashing on the screen while on the call. If you’re open to discussing it further, please contact Support Team via Live Chat on the Panasonic Website, Contact Us option, Mon-Fri, 9am-5pm EST in order to determine how we can provide you with a solution: https://shop.panasonic.com/contactus . -M
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