TABLE OF CONTENTS RTP uses RTCP to monitor the service quality. RTCP provides service monitoring reports to help manage the RTP process. These RTCP reports are typically generated by each device in the connection every five seconds, and they are sent with a different UDP port address than the voice packets. RTCP messages can also be monitored by a performance monitoring tool or a third party (e.g., a carrier) to track the performance of the network service. RTCP generates periodic reports, which include information like packet and octet counts, lost packet count, and inter-arrival jitter. See Table 7-2.
| IP Problems | Delay Problems | Signal/Noise Problems | Echo Problems | Configuration Problems |
|---|---|---|---|---|
| Packet Loss Rate, Packet Discard Rate, Burst Length, Burst Density, Gap Length | Packet Path Delay, End System Delay | Signal Level, Noise Level | Echo Level, Round Trip Delay | Jitter Buffer Configuration, PLC Type, End System Delay |
Sender Report: Sent by an RTP source and provides transmit and receive statistics. Those statistics would include the sender s packet and octet counts as well as the receive statistics identifying packets lost, percent lost, and inter-arrival jitter experienced. The lost packet statistics would be based on the sender reports from the other party in the connection.
Receiver Report: Includes the same information as a sender report but is generated if the device has not had any packets to send since the previous report.
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