Multiple Input Files and No Documentation on Sorting

[demonspork]

I am capturing traffic on a server with tcpdump rotating files, and occasionally need to use sngrep for the SIP part of these captures.

If I discover that a call spans multiple capture files, like "capture-2020-09-02.pcap7" and "capture-2020-09-02.pcap8" I use sngrep with -I twice.
sngrep -I capture-2020-09-02.pcap7 -I capture-2020-09-02.pcap8
This has resulted in an Index issue where the call times no longer match the index. It is almost like it is reading both files in parallel and ignoring the timestamps so they get mixed together. Is there any way to control the multiple-file loading behavior to prevent this issue?

Another problem is that I was unable to sort by any other columns than ID because no documentation exists for the <> sort columns shortcuts. I checked the man page, wiki, and the F1 help in sngrep and it isn't mentioned anywhere. I have gone ahead and added it to the wiki at https://github.com/irontec/sngrep/wiki/CallList but I feel it would be extremely helpful in the both the Help and in the Man page.

The only reason I figured it out was because it was mentioned in issue #300 with someone even saying it should be in the help, but I can not locate it.