Has anyone experienced a "left off the hook" sound emanating from their V551? Randomly the sound is heard shortly after hanging up the phone. I have verified the phone is hung up after making or receiving a call. Also, the sound will randomly be heard when connected to MPT with it flipped open. Notice a data icon (secure Circuit Switch Data call) on the external display, however it’s displayed only momentarily.

Appreciate any assistance or advise.


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