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doc: Include mgwpool.adoc from osmo-gsm-manuals

This way we document the recently gained support for MGW pooling.

Related: SYS#5987
Depends: osmo-gsm-manuals.git Change-Id Ieda0d4bfe6fc90da6e19c791d8ec2da89427ba3b
Change-Id: I3dc8a4b50f13ad50390ba82e64fe4ebe0b97d4e5
---
M doc/manuals/chapters/running.adoc
M doc/manuals/osmohnbgw-usermanual.adoc
2 files changed, 21 insertions(+), 2 deletions(-)

git pull ssh://gerrit.osmocom.org:29418/osmo-hnbgw refs/changes/22/29822/1

diff --git a/doc/manuals/chapters/running.adoc b/doc/manuals/chapters/running.adoc
index e575215..93c484b 100644
--- a/doc/manuals/chapters/running.adoc
+++ b/doc/manuals/chapters/running.adoc
@@ -136,11 +136,28 @@
 
 ----
 hnbgw
- mgcp
+ mgw 0
   mgw remote-ip 127.0.0.1
   mgw remote-port 2427
-  mgw reset-endpoint rtpbridge/*
+  mgw reset-endpoint rtpbridge/* <1>
 ----
+<1> The 'reset-endpoint' setting instructs the OsmoMGW to send a wildcarded
+DLCX to the media gateway. This helps to clear lingering calls from the
+media gateway when the OsmoMSC is restarted.
+
+OsmoMSC is also able to handle a pool of media gateways for load
+distribution. See also <<mgw_pooling>>.
+
+[NOTE]
+====
+Previous versions of OsmoHNBGW didn't have the 'mgw' VTY node and
+hence didn't support the MGW pooling feature. Therefore, historically the MGW
+related commands where placed under the `mgcp` VTY node. The MGW related commands
+under the `mgcp` VTY are still parsed and used but its use is deprecated and
+hence discouraged in favour of the new `mgw` node. Writing the config to a file
+from within OsmoMSC will automatically convert the config to use the new `mgw`
+node.
+====
 
 ==== Configure co-located User Plane Function
 
diff --git a/doc/manuals/osmohnbgw-usermanual.adoc b/doc/manuals/osmohnbgw-usermanual.adoc
index 21faed7..61a00b9 100644
--- a/doc/manuals/osmohnbgw-usermanual.adoc
+++ b/doc/manuals/osmohnbgw-usermanual.adoc
@@ -24,6 +24,8 @@
 
 include::./common/chapters/cs7-config.adoc[]
 
+include::./common/chapters/mgwpool.adoc[]
+
 // include::{srcdir}/chapters/net.adoc[]
 
 // include::./common/chapters/control_if.adoc[]

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