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-rw-r--r--doc/manuals/chapters/configuration.adoc14
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diff --git a/doc/manuals/chapters/configuration.adoc b/doc/manuals/chapters/configuration.adoc
index 107fcfdc..6b9adc11 100644
--- a/doc/manuals/chapters/configuration.adoc
+++ b/doc/manuals/chapters/configuration.adoc
@@ -147,6 +147,20 @@ only in the current session of OsmoBTS.
De-activation can be performed similarly by using the `no gsmtap-sapi
sdcch` command at the `bts` node of the OsmoBTS VTY.
+It may be useful to enable all SAPIs with a few exceptions, or vice versa
+disable everything using one command. For this purpose, the VTY provides
+`gsmtap-sapi enable-all` and `gsmtap-sapi disable-all` commands.
+
+.Example: Enabling all SAPIs except PDTCH and PTCCH
+----
+bts 0
+ gsmtap-sapi enable-all <1>
+ no gsmtap-sapi pdtch <2>
+ no gsmtap-sapi ptcch <2>
+----
+<1> Enable all available SAPIs
+<2> Exclude PDTCH and PTCCH SAPIs
+
From the moment they are enabled via VTY, GSMTAP messages will be
generated and sent in UDP encapsulation to the IANA-registered UDP port
for GSMTAP (4729) at the IP address specified in the command line