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Incoming Call Issues

Dear All,

I have a SIP trunk from the provider and terminated to cisco CUBE. I have CUCM 12.x as Call Control. the outgoing call works fine and two-way audio established. For an incoming call, the IP Phone is ringing. Once answered no audio, and the calling device doesn't show that the call is been connected. 

 

Call Flow 

 

ITSP<-->CUBE<-->CUCM (IP Phone)

 

My CUBE is sending the ringing message and getting timed out. 

 

 

 

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