User manual

4-25
Chapter 4
Analyze Network
VoIP - cont.
VoIP example - cont.
NOTE: Select another Test button visible on the screen or by scrolling
to the right or left with the white arrows or select the Exit button.
Media Stream
MEDIA STREAM shows the details of the RTP connections for the calls
and the protocols (codecs) being used. This is the information negotiated
with the SIP server. For each end being used, the IP address and the
codec (if known) are displayed.
SERVER - shows the server <end> of the RTP link.
DEVICE - shows the device <end> of the RTP link - generally, this will be
the same IP as the one used by the device for SIP but, not always.
STATISTICS - shows the statistics for each of the two RTP data streams
as measured by the LanExpert (we do NOT use any received RTCP
data). The <DEVICE> column shows the data for the stream coming from
the device. The <SERVER> column shows the data for the stream coming
from the server.
RTCP FRAMES - shows a count of the RTCP frames (if any).
RTP FRAMES - shows a count of the number of RTP (i.e. data stream)
frames. Since audio is usually 50fps, this can be used to provide an
estimate of the length of the call. Note - the DEVICE and SERVER data
should be similar.
Example VoIP Screen 4