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Wierd whirlingly Tone and Red lights emitted from M3904

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Telecomguy333

Telecomguy333

Technical User
Jan 11, 2012
27
US
We have a CS1000 PBX with about 2400 digital sets with a fraction of them being M3904 phones the rest 2000 series. Ocassionaly a M3904 phone will freak out and start blasting out a whirlingly tone over the speaker and the MWI light will flash. I'm not seeing any output codes or errors on the PBX terminal. Unplugging the phone momentarily seems to resolve it.

Any ides??
 
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