{HEAD ~ This information} is relayed using the Network layer to provide feedback to the MAC layer in order to improve the end to end performance of {TAIL ~ VoIP services} 
{ HEAD ~ This information } is relayed using the Network layer to provide feedback to the MAC layer in order to improve the end to end performance of { TAIL ~ VoIP services }
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL