manual: explain IuPS, add SCCP/M3UA section from common chapters
Add 'cs7' default configuration, link to the
osmo-gsm-manuals/common/cs7-config.adoc chapter to fully explain the 'cs7'
client configuration.
Related: OS#2767
Depends: Ia2508d4c7b0fef9cdc57e7e122799a480e340bf7 (osmo-gsm-manuals)
Change-Id: If0f7c8fc4b94eb40b62570cf90999d5074dc00ee
diff --git a/doc/manuals/chapters/configuration.adoc b/doc/manuals/chapters/configuration.adoc
index fd2d7ed..7d3072e 100644
--- a/doc/manuals/chapters/configuration.adoc
+++ b/doc/manuals/chapters/configuration.adoc
@@ -356,3 +356,23 @@
sgsn
encryption GEA0
----
+
+=== Configure SCCP/M3UA to accept _IuPS_ links
+
+OsmoSGSN acts as client to contact an STP instance and establish an SCCP/M3UA
+link.
+
+An example configuration of OsmoSGSN's SCCP link:
+
+----
+cs7 instance 0
+ point-code 0.23.4
+ asp asp-clnt-OsmoSGSN 2905 0 m3ua
+ remote-ip 127.0.0.1
+ sctp-role client
+ as as-clnt-OsmoSGSN m3ua
+ asp asp-clnt-OsmoSGSN
+ routing-key 0 0.23.4
+----
+
+This configuration is explained in detail in <<cs7_config>>.