Updating Info Gathering voip and vpn

adding tools for voip and vpn

tools/enumiax.md

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+# enumiax
+
+Notes
+-------
+
+Help Text
+-------
+```
+enumIAX 0.4a
+Dustin D. Trammell <dtrammell@tippingpoint.com>
+
+Usage: enumiax [options] target
+  options:
+    -d <dict>   Dictionary attack using <dict> file
+    -i <count>  Interval for auto-save (# of operations, default 1000)
+    -m #        Minimum username length (in characters)
+    -M #        Maximum username length (in characters)
+    -r #        Rate-limit calls (in microseconds)
+    -s <file>   Read session state from state file
+    -v          Increase verbosity (repeat for additional verbosity)
+    -V          Print version information and exit
+    -h          Print help/usage information and exit
+
+```
+
+Example Usage
+-------
+
+Links
+-------
+