User's Manual

66xx/67xx Router Users Guide 41
RTCP
Real-Time Packet Protocol (RTP) statistics can be used to determine activity sent into the
network or received from the network on the VoIP lines. RTP is used with Real-time Control
Protocol (RTCP) which monitors transmission statistics through control packets sent into or
received from the network.
Cumulative statistics are kept across calls
Packets Sent: The cumulative count of data bytes in the packets sent to the network
Bytes Sent: The cumulative count of data bytes in the packets sent to the network
Bytes Received: The cumulative count of data bytes in the packets received from the network
Packets Lost: The number of packets not received based upon sequence numbers
Packets Discarded: The number of packets received but discarded
RTCP Sent: The number of control packets sent into the network
RTCP Received: The number of control packets received from the network
RTCP XR Sent: The number of extended reporting control packets sent into the network (should be
the same as RTCP Sent)
RTCP XR Received: The number of extended reporting control packets received from the network
Jitter statistics are kept from the previous call
Jitter (ms): The average delay variation (Jitter) between RTP packets
Peak Jitter (ms): The peak delay variation (Jitter) between RTP packets
Minimum Jitter Buffer (ms): The least delay an RTP packet had passing through the Jitter buffer
Maximum Jitter Buffer (ms): The greatest delay an RTP packet had passing through the Jitter
buffer
Average Jitter Buffer (ms): The average delay an RTP packet had passing through the Jitter
buffer
Round Trip Delay (ms): The two way network delay
Peak Round Trip Delay (ms): The worst two way network delay
Overruns: Number of packets received that could not be sent to the Jitter buffer since it was full
Underruns: The number of times the Jitter buffer was empty