diff --git a/advanced/images/subproxy.svg b/advanced/images/subproxy.svg
new file mode 100755
index 0000000..8b157ec
--- /dev/null
+++ b/advanced/images/subproxy.svg
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diff --git a/advanced/subproxy.rst b/advanced/subproxy.rst
new file mode 100644
index 0000000..0bd9a2d
--- /dev/null
+++ b/advanced/subproxy.rst
@@ -0,0 +1,50 @@
+..
+   SPDX-FileCopyrightText: © 2020 Open Networking Foundation <support@opennetworking.org>
+   SPDX-License-Identifier: Apache-2.0
+
+Subscriber Proxy
+================
+
+The Aether subscriber proxy is a component that sits between the SD-Core's simapp
+SIM card management subsystem and the SD-Core's configuration service, and communicates
+newly provisioned SIM cards to the ROC.
+
+.. image:: images/subproxy.svg
+  :width: 400
+
+How Subscriber Proxy Works
+==========================
+
+The subscriber proxy transparently intercepts simapp traffic and inspects each message for
+the IMSI that is contained in that message. If the IMSI is a new one that is not
+already present in the ROC, then the subscriber proxy will contact the ROC to insert a
+Sim-Card object with that IMSI.
+
+The subscriber proxy will attempt to insert the SIM Card into the appropriate site. It does
+this by examining the `imsi-definition` for each site, until subscriber proxy finds a
+site whose `mcc`, `mnc`, and `enterprise` match the IMSI that has been intercepted
+from simapp. For this to work, the `imsi-format` must be set appropriately, for example
+to `CCCNNEESSSSSSSS`. Setting the `imsi-format` to `SSSSSSSSSSSSSSS` will not allow the
+subscriber-proxy to automatically determine the site. If no matching site exists, then
+the subscriber proxy will attempt to add the Sim-Card to a site whose identifier is
+`defaultent-defaultsite`.
+
+If no appropriate site can be determined, then the subscriber proxy will not add the
+sim-card to the ROC, but the request will still be passed to SD-Core.
+
+Configuring simapp
+==================
+
+To configure simapp to send messages to the subscriber proxy, edit simapp's configuration
+file as follows::
+
+    simapp.yaml:
+      configuration:
+        sub-proxy-endpt:
+          addr: subscriber-proxy.aether-roc.svc.cluster.local
+          port: 5000
+
+In the above example, `subscriber-proxy.aether-roc.svc.cluster.local` is the address of the
+subscriber proxy. Do not remove the existing `sub-provision-endpt` as that setting contains
+the address of the SD-Core, and will be passed through the proxy, so the proxy knows which
+core to connect to.