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Difference Between CP-7821-k9= and CP-7821-k9++=

Sir,

We are using  huge number of Cisco VoIP phones with Part number PID VID: CP-7821-k9= 

Recently we received the same VoIP phones with different part number  PID VID: CP-7821-k9++= 

 

Please clarify the below points for our reference please

    Is there any difference between two part numbers.

    What is the meaning for second Part number CP-7821-k9++= 

 

Thanks and Regards

 

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