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SIP Reinvite Dumped call - resource not available - codec change

We've been having periodic issues in our environment where calls receive an Invite at some point during the call and are lost.  CDR showing termed on behalf of code 13 for both ends and a disconnect cause as error 47 resource not available.  The aspects we can't wrap our heads around is why and what resource is trying to be used here.  The calls start out in G729 just fine, when the reinvite occurs we see it attempting to use G711.  Our devices are set for g729 preferred but also set to support G711.  

Any help would be appreciated.  Below is the Translator X diagram.  I've attached the CUCM logs for that call.  What else could I provide that can help us get to the bottom of this?

 

 

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