diff --git a/common/vty_additions.xml b/common/vty_additions.xml
index d32cea2..ef442f5 100644
--- a/common/vty_additions.xml
+++ b/common/vty_additions.xml
@@ -5,31 +5,30 @@
-
- Show Node for introspection
- This is the default node when connecting to the
+
+ The view node is the default node when connecting to the
VTY interface. This node does not require any additional
permission and allows to introspect the application.
-
- Enable Node for admin commands
- This is a privileged node allowing to make changes
- to the configuration and allow to access more commands. Everything
- available on the show node should be available here.
+
+ The enable node is a privileged node, allowing to make changes
+ to the configuration and to access further commands like 'configure'.
+ All commands seen on the view node are also available here.
-
- Configuration Node for configuration
- This is the base node for all configuration nodes. It
- allows to enter BTS and logging node to configure them.
+
+ The config node is the root for all configuration commands,
+ which are identical to the config file format. Changes made on the telnet
+ VTY can be made persistent with the 'write file' command.
-
-
- Logging Node for logging configuration
- This is the node is a child of the configuration node and
- is responsible for configuring the logging framework including the
- log targets and log levels.
+
+
+ The log node is commonly available in all Osmocom programs and
+ allows configuring logging to stderr and/or log files, including logging
+ category and level filtering as well as output formatting options.
+ Note that the 'logging enable' command is required to make logging commands
+ available on the telnet VTY.
@@ -39,10 +38,21 @@
+
+ This command is required to make logging commands available
+ on the telnet VTY.
+
- The logging framework has the concept of filters. This can
- be used to only show log messages that apply to a given timeslot or
- subscriber. The all filter allows all messages to pass unfiltered.
+ Disable/enable general log output on a given target.
+ Typically, 'logging filter all 1' allows to see the usual log output on a
+ given target. Setting to '0' can be useful when logging to the telnet VTY
+ console: mute all log output to allow typing VTY commands on the telnet
+ prompt without interference from log output; 'logging filter all 1' then
+ re-enables logging in the same log output configuration as before.
+
+ Some applications provide more specific filters, e.g. to log a given IMSI
+ only. To employ such filters, set 'logging filter all 0' to disable
+ general logging, and then enable a more specific filter instead.