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Cisco Bug: CSCvt18740 - Loud buzzing noise when pressing speaker/Class-D Amplifier Damage Issue

Last Modified

Jun 08, 2020

Products (1)

  • Cisco IP Phone 7800 Series with Multiplatform Firmware

Known Affected Releases


Description (partial)

After Upgrade 78XX to Firmware 11.2.3, may cause permanent damage to speaker due to Class D Amplifier damage issue.

Impacted phone models:
7811, 7821, 7841, 7861,6841,6861,6871,6851

Firmware version 11.2.3
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Bug Details Include

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  • Status
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