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7912 & 7911: cannot hear from the other end

Hi Guru's

I have a CCME 2851 & 7961,7912 & 7911 phones. I have installed the successfully but sometimes when i call from one phone to another the other party can't hear me! sometimes it works and sometimes it doesn't. what might be the problem guys??

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Re: 7912 & 7911: cannot hear from the other end

It is codec mismatch problem, check SCCP are all up and paste your running config.

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