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Beeping sound

Hi,

We have CCM 4.1(3)SR1 and Unity VM.

We also have two types of IP Phones distrobuted: 7912 and 7960. I have lately noticed that when call is made from 7960 to a dial-pattern that has "Provide outside dialtone" box checked, just before I hear the dialtone, I hear three consequitive beeping sounds. The sounds are very quick, but still somewhat annoying.

This happens to all 7960s, but does not happen to any of 7912s.

There are no unread VM messages, so this is also not an option...

What can be causing it?

Thanks,

David

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