[cisco-voip] no reply from callback

[proactiveone at gmail.com]

Hi,

I  have one urgent requirement from my customer. They have cluster of call
managers 5.1
The requirement from the customer is that
he wants to configure 10 cisco phones in such
a way that they can only make call in and out of the company. But if anyone
call them back
on the same numbers from outside(landline or mobile etc) the other party
should get the busy
or any unreachable tone. Anyone have the idea how can I accomplish this??

Thank you all in advance...

Regards
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