def getPacketHeaderStackIdObj(self, configElementObj, stackId):
        """
        Desciption
           This API should be called after calling showTrafficItemPacketStack(configElementObj) in
           order to know the stack ID number to use.  Such as ...

            Stack1: Ethernet II
            Stack2: MPLS
            Stack3: MPLS
            Stack4: MPLS
            Stack5: MPLS
            Stack6: IPv4
            Stack7: UDP
            Stack8: Frame Check Sequence CRC-32

        Parameters
           configElementObj: /api/v1/sessions/1/ixnetwork/traffic/trafficItem/{id}/configElement/{id}
           stackId: In this example, IPv4 stack ID is 6.

         Return stack ID object: /api/v1/sessions/1/ixnetwork/traffic/trafficItem/{id}/configElement/{id}/stack/{id}
        """
        response = self.ixnObj.get(self.ixnObj.httpHeader+configElementObj+'/stack')
        self.ixnObj.logInfo('\n', timestamp=False)
        for (index, eachHeader) in enumerate(response.json()):
            self.ixnObj.logInfo('{0}: {1}'.format(index+1, eachHeader['displayName']), timestamp=False)
            if stackId == index+1:
                self.ixnObj.logInfo('\tReturning: %s' % self.ixnObj.httpHeader+eachHeader['links'][0]['href'], timestamp=False)
                return eachHeader['links'][0]['href']