Patent ID: 7764679

Claim:
A method, performed in a session router, for determining lost packets for real-time transport protocol (RTP) data flows , comprising the steps of: obtaining a sequence number of a received RTP data packet within said RTP data flow; determining whether said received RTP data packet is early; if said received RTP data packet is early, marking a first corresponding entry in a current scoreboard array to indicate a missed RTP data packet; determining whether said received RTP data packet is late; if said received RTP data packet is late, finding a second corresponding entry in an appropriate one of the current scoreboard array or an aged scoreboard array, the appropriate one based on the sequence number of the received RTP packet; and responsive to the second corresponding entry indicating a missed RTP data packet, marking the second corresponding entry to indicate a received RTP data packet and decrementing a missing packet counter for the appropriate one of the current scoreboard array or the aged scoreboard array.