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DT820 IP 8 button Phone help.

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Ronj123434

IS-IT--Management
Oct 25, 2021
6
US
I'm currently installing and troubleshooting for a school district. We have had 2 phones at the same location have this issue.

When a caller calls the user, the callers voice is repeated instantly back to the caller. The User does not hear this at all, it's only on the caller side. We already replaced 1 phone and no more issues, but now another phone has this issue and after installed thousands of phones these two just happen to be at the same location? Has anyone else heard of this issue or a solution?
 
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