[cisco-voip] calls to DID is received for some time, after that is not received, but sip a/c is still registered.

[sam singapore]

Hi,

Right after we reboot the ISR and sip account is registered with the
provider for the first time, all calls to the DID numbers are  receivedby
the  auto attendant. After some time, when we call, the call does not come
at all.  checking sip registration shows the sip number being registered. Is
this any keepalive or any ports/registration issue ? how do I troubleshoot
this issue? ccapi inout does not show any attempt of the incoming call at
all.  Provider says its all OK in their end and see our sip account
registered. I am using Cisco Unity Express Version 7.2 / Cisco Unified IVR
Express

Thanks,
Sam
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