{HEAD ~ A RTP sequence number} associated with a compressed RTP packet is determined based on {TAIL ~ the determined relationship} and at least one of the RLP sequence numbers of the received RLP packet or packets forming the compressed RTP packet 
is determined based on
{ HEAD ~ A RTP sequence number } associated with a compressed RTP packet is determined based on { TAIL ~ the determined relationship } and at least one of the RLP sequence numbers of the received RLP packet or packets forming the compressed RTP packet
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH REL 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 OTH OTH