OsmoSGSN: configuration: Document CDR CTRL interface
Change-Id: Ib729e2fc4898c20d27e95fc0f13abe9c0656dda5
diff --git a/doc/manuals/chapters/configuration.adoc b/doc/manuals/chapters/configuration.adoc
index f995bc7..2828987 100644
--- a/doc/manuals/chapters/configuration.adoc
+++ b/doc/manuals/chapters/configuration.adoc
@@ -175,7 +175,7 @@
OsmoSGSN can write a text log file containing CDR (call data records),
which are commonly used for accounting/billing purpose.
-.Example: CDR configuration
+.Example: CDR log file configuration
----
OsmoSGSN(config-sgsn)# cdr filename /var/log/osmosgsn.cdr
OsmoSGSN(config-sgsn)# cdr interval 600 <1>
@@ -185,6 +185,20 @@
The CDR file is a simple CSV file including a header line naming the
individual fields of each CSV line.
+==== CDR CTRL interface
+
+Independently of whether logging CDR to a file is enabled or not, OsmoSGSN can
+also provide delivery of CDR through the CTRL interface. CDR are sent by means
+of TRAP messages with variable name _cdr-v1_, and its value is filled using the
+same CSV line format as in the log file, but without CSV header line.
+
+.Example: CDR delivery through CTRL TRAP messages
+----
+OsmoSGSN(config-sgsn)# cdr trap
+----
+
+==== CDR Format
+
[[sgsn-cdr]]
.Description of CSV fields in OsmoSGSN CDR file
[options="header",cols="15%,85%"]