Fluke Network Tester user manual Viewing Call Quality Measurements, RTP drop

NetTool

Users Manual

Viewing Call Quality Measurements

The VoIP Monitor tracks call quality (RTP data). To display the VoIP Monitor, do the following:

1.From the Main menu, select VoIP/Toolkit.

2.On the VoIP/Toolkit menu, select VoIP Monitor to display the screen shown in Figure 7-4:

ahn309s.bmp

Figure 7-4. VoIP Monitor

The VoIP Monitor includes RTP statistics and RTCP information (when present) for both the phone side and the network side. You can view this data this while a call is in progress. Table 7-1 defines the RTP and RTCP statistics seen on this screen.

Table 7-1. VoIP Monitor RTP/RTCP Statistics

Statistic	Meaning
RTP frm	The number of RTP frames.
RTP drop	The number of dropped RTP frames. An
	RTP frame is considered dropped when it
	does not arrive within 16 frames.
RTP jttr	The difference between the maximum and
	minimum frame inter-arrival time. This is
	an unbuffered measurement of the raw
	packet arrival times.
RTP seqEr	The number of frames that arrived out of
	sequence but within the 16-frame-drop
	window.
RTCP1 frm	The number of RTP frames.
RTCP1 drop	The number of dropped packets as
	measured, post buffer, by the endpoint.
RTCP1 jttr	The amount of jitter as reported by the
	endpoint.

1RTCP is an optional control protocol that is sent from the RTP endpoints. It contains call quality information as reported by the two RTP endpoints involved in the conversation.

7-4