EXFO EXpert VoIP Test Tools - Manual (Page 31)

Test Setup
EXpert IP 25
Configuration (RTP)

Record check box when selected (cleared by default) allows
recording network VoIP traffic. The recorded file can be listened from
the Load/Save option; refer to Save/Load - Record Audio Tab on
page 87 for more information. Record is only available for Live Call
media type.
Capture Filters
Available when the Utilities - Capture check box is selected.

IP Address check box when selected (cleared by default) represents
the Peer IP Address that acts as a filter that will capture packets having
the source or destination IP address matching the specified Peer IP
address. The accepted range is from 0.0.0.1 to 223.225.225.225.

File Size represents the maximum size of the file to capture either in
megabytes (1 to 50 MB (default is  )) or in seconds (1 (default) to
3600 seconds).