cisco ip telephone

Unanswered Question
May 24th, 2010
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hi all,


i have cisco ccme with 20 ip phones


my phones are suddenly showing in the screen phone with cross mark then we cannot able to dial local extension also



my firmware version   c2800nm-advipservicesk9-mz.124-15.T5.bin


if i restart the router then it works fine. can you explain what is the reasons.


thanks

cyril

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