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This will give you a list of file sizes, largest from top, allowing you to find extensions and directories that need attention.
Is there a method to do a Packet Capture on the sipxecs server?
If needing a SIP packet capture you can use the Homer on the system which is now a part of 4.6. However, sometimes you want more than sip, and you need a tool that can capture more. The tool tcpdump can capture packets from any interface you select, and display them on the screen or write to a file, or perform many other options.
From the Command Line - run "yum install tcpdump"
After installed, run tcpdump -w 0001.pcap -i etho The command is basically saying run tcpdump -w (write to file) 0001.pcap -i (interface) eth0.
An internet search for tcpdump will find lots of documentation for other tasks you can perform on the system using tcpdump.