1. P A PE PE A B MPLS Network Carry VoiceReal Time Protocol (RTP) Between 1:00 to 1:05 Router B received only 49,500 voice packet from Router A Between 1:00 to 1:05 Router is sending over 50,000 voice packet to router B via STM-1 Interface configure with QoS, allow RTP as high priority traffic STM-1/OC3 155 Mbps 12404 12406 Voice , RTP traffic 1 Ge 7609 1 Ge 1 Ge Between 1:00 to 1:05 GW “B” voice call drop due to lost packets of 500 packets Between 1:00 to 1:05 50,000 voice packet is sent to GW “B” Ericsson Media gateway B (Soft switch) Ericsson Media gateway A (Soft switch)