diff --git a/doc/manuals/chapters/configuration.adoc b/doc/manuals/chapters/configuration.adoc
index d031ce6..d778929 100644
--- a/doc/manuals/chapters/configuration.adoc
+++ b/doc/manuals/chapters/configuration.adoc
@@ -252,8 +252,40 @@
 CGI-PS, since it actually equals to the Circuit Switch CGI + RAC.
 
 In order to apply this target cell identity translation, OsmoPCU uses the
-OsmoBSC Neighbor Resolution CTRL interface (see OsmoBSC User Manual), since the
-BSC is the node holding all the neighbor related information.
+OsmoBSC Neighbor Resolution Service. This service is nowadays provided by means
+of PCUIF container messages, which are transparently forwarded in both directions
+by the BTS using the IPA multiplex of the OML connection against the BSC. No
+specific configuration is required in any of the involved nodes, they should
+behave properly out of the box.
+
+These neighbor address resolutions (<ARFCN + BSIC> => <RAI + CI>) are by default
+cached for a while, in order to avoid querying the BSC frequently. As a result,
+the resolution time is also optimized.
+
+.Example: Configure Neighbor Resolution cache and timeouts
+----
+pcu
+ timer X1 500 <1>
+ timer X0 60 <2>
+----
+<1> Time out if the BSC doesn't answer our resolution request after 500 ms
+<2> Keep resolved neighbor addresses cached for 60 seconds
+
+===== OsmoBSC CTRL interface (deprecated)
+
+CAUTION: This interface is nowadays considered deprecated and should not be used
+anymore. Any related VTY options should be dropped from configuration files, to
+let OsmoPCU use the new interface instead. This section is kept here for a while
+as a reference for old deployments using old versions of the programs.
+
+This Neighbor Address Resolution Service was initially implemented by means of a
+separate CTRL interface (see OsmoBSC User Manual), where OsmoPCU would create a
+CTRL connection to the BSC each time an address resolution was required.
+
+Older versions of OsmoBSC may not support the current Neighbor Address
+Resolution Service over the IPA multiplex (see above). For those cases, OsmoPCU
+can be configured to use the old deprecated CTRL interface.
+
 By default, the use of this interface is not configured and hence disabled in
 OsmoPCU. As a result, until configured, the network won't be able to provide the
 System Information to the MS prior to allowing the change during NACC against
@@ -261,20 +293,12 @@
 to configure the interface, the OsmoBSC IP address and port to connect to must
 be configured in OsmoPCU VTY.
 
-These neighbor address resolutions (<ARFCN + BSIC> => <RAI + CI>) are by default
-cached for a while in order to avoid querying the BSC frequently and, as a
-result, optimizing the resolution time too.
-
 .Example: Configure Neighbor Resolution CTRL interface against OsmoBSC
 ----
 pcu
  neighbor resolution 172.18.13.10 4248 <1>
- timer X1 500 <2>
- timer X0 60 <3>
 ----
 <1> Port 4248 is the default and hence could be omitted in this case
-<2> Time out if the BSC doesn't answer our CTRL resolution request after 500 ms
-<3> Keep resolved neighbor addresses cached for 60 seconds
 
 ==== System Information Resolution
 
