[cisco-voip] 7942/7962 - Firmware 8.5(2)

[Ryan Ratliff]

I'd say the symptom is you hear something odd in the headset after  
going offhook on a 79x2/5 phone.  The DC offset I believe is the  
wrong voltage being sent to the DAC (digital to analog converter).   
Basically it's a phone DSP issue that causes something bad.

-Ryan

On Jun 3, 2009, at 11:14 AM, Carter, Bill wrote:

What is DC Offset in the receive (DAC) path? What are the symptoms?



CSCsx02046

Receive DC offset may trigger idle tones on Cisco Unified IP Phone  
7975G, 7965G, 7962, 7945G, and, 7942G



Receive dc offset may trigger idle tones on 7942/64/45/65/75

Symptom:
dsp may introduce a dc offset in the receive (DAC) path.

Conditions:
handset mode (possibly other modes).

Workaround:
none





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