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VOIP inbound outbound call

Unanswered Question
Mar 14th, 2014
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I have Cisco 2811 with with WIC- 2T and VIC2- FXO. Data comb is working fine. But when I make a VoIP call from PBX extn to remote VoIP number DCD goes down immediately. After a while DCD goes up and data comb restored. There is no inbound call. I have replaced FXO and WIC card to short out the problems. But in all are in vain. Router have 8 ch PVDM .Help me to get rid off this problem
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