modules: readme files regenerated - sipdump ... [skip ci]

src/modules/sipdump/README

@@ -154,9 +154,13 @@ modparam("sipdump", "enable", 1)
 3.2. mode (int)
 
    Set the type of activity done by the module, the value can be set based
-   on flags: 1 - write to files; 2 - execute event route
+   on flags: 1 (value 1) - write to text files; 2 (value 2) - execute
+   event route; 3 (value 4) - write to pcap files.
 
-   Default value is 1 (write to files).
+   To enable several activity modes, set the parameter to the sum of
+   correspinding values.
+
+   Default value is 1 (write to text files).
 
    Example 1.2. Set mode parameter
 ...
@@ -199,7 +203,8 @@ modparam("sipdump", "folder", "/run/kamailio")
 3.6. fprefix (str)
 
    File name prefix. The date is appended to this prefix in the format
-   yyyy-mm-dd--hh-mm-ss. The extension of the file is ".data".
+   yyyy-mm-dd--hh-mm-ss. The extension of the text file is ".data", of the
+   meta file is ".meta" and of the pcap file is ".pcap".
 
    Default value is "kamailio-sipdump-".
 
@@ -299,3 +304,9 @@ route[TCLEAN] {
     exec_cmd("find /tmp -type f -name kamailio-sipdump-* -mtime +1 -delete &");
 }
 ...
+
+   If operational mode is set to write the pcap files, note that packets
+   in the pcap file are generated always with transport UDP, no matter the
+   SIP traffic was over another transport layer like TCP, TLS, SCTP or
+   WSS. The headers of the SIP message (e.g., Via, Route) should provide
+   hints about what the SIP transport layer.