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