mgw: Allow auditing speciall 'null' endpoint
This is a special endpoint which can always be audited. This is useful
for clients who wish to submit requests to osmo-mgw periodically to find
out whether the MGW is still reachable. This endpoint will be used by
libomso-mgcp-client as default target endpoint to implement such
feature.
This "null" Endpoint is osmo-mgw specific, not described in MGCP specs.
Related: SYS#6481
Change-Id: Ia409b16e9211e6261e2e0f21288544289d6f3733
diff --git a/doc/manuals/chapters/mgcp_endpoints.adoc b/doc/manuals/chapters/mgcp_endpoints.adoc
index 797fdea..2fb6e16 100644
--- a/doc/manuals/chapters/mgcp_endpoints.adoc
+++ b/doc/manuals/chapters/mgcp_endpoints.adoc
@@ -91,4 +91,10 @@
not yet useable.
NOTE: the VTY command "show mgcp" can be used to get a list of all available
-endpoints (including identifiers)
\ No newline at end of file
+endpoints (including identifiers)
+
+=== The `null` endpoint
+
+OsmoMGW offers a special `null@<domain>` endpoint which can be audited at all times.
+This is useful for MGCP clients who wish to submit requests to OsmoMGW
+periodically to find out whether it is still reachable and in a working state.
\ No newline at end of file