Cisco IP Telephony Troubleshooting Guide for Cisco CallManager Release 3.0(1)

Field Definitions

numberOctetsReceived

numberPacketsLost

jitter

latency

Call Records Logged By Call Type

The number of octets (bytes) of data received during this call

The total number of payload octets (that is, not including header or padding) received in RTP data packets by the device since starting reception on this connection. The count includes packets received from different sources, if this is a multicast call. The value is zero if the connection was set in “send only” mode.

Lost RTP packets during this connection

The total number of RTP data packets that have been lost since the beginning of reception. This number is defined as the number of packets expected less the number of packets actually received, where the number of packets received includes any that are late or duplicates. Thus, packets that arrive late are not counted as lost, and the loss may be negative if there are duplicates. The number of packets expected is defined to be the extended last sequence number received, as defined next, less the initial sequence number received. The value is zero if the connection was set in “send only” mode. (For details, see RFC 1889)

The interarrival jitter during this connection

An estimate of the statistical variance of the RTP data packet interarrival time, measured in milliseconds and expressed as an unsigned integer. The interarrival jitter J is defined to be the mean deviation (smoothed absolute value) of the difference D in packet spacing at the receiver compared to the sender for a pair of packets. Detailed computation algorithms are found in RFC 1889. The value is zero if the connection was set in “send only” mode.

The latency experienced during this connection

The value is an estimate of the network latency, expressed in milliseconds. This is the average value of the difference between the NTP timestamp indicated by the senders of the RTCP messages and the NTP timestamp of the receivers, measured when these messages are received. The average is obtained by summing all the estimates, then dividing by the number of RTCP messages that have been received. (For details see RFC 1889)

Each normal call between two parties logs one CDR End Call record. Each End Call record contains all fields identified above, but some fields may not be used. If a field is not used, it will be blank if it is an ASCII string field, or “0” if it is a numeric field. When supplementary services are involved in a call, more End Call records may be written.

In addition to the CDR End Call record, there may be up to one CMR record per endpoint involved in a call. In a normal call between two parties each using a Cisco IP Phone, there will be two CMR records written: one for the originator, and one for the destination of the call. This section describes the records written for different call types in the system.

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Cisco Systems 30 VIP manual Lost RTP packets during this connection, Interarrival jitter during this connection
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30 VIP specifications

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