topoh: enhaced description of mask_ip parameter

modules/topoh/README

@@ -10,7 +10,7 @@ Daniel-Constantin Mierla
 
    <[email protected]>
 
-   Copyright © 2009 FhG FOKUS
+   Copyright © 2009 FhG FOKUS
      __________________________________________________________________
 
    Table of Contents
@@ -132,8 +132,9 @@ modparam("topoh", "mask_key", "some secret here")
 3.2. mask_ip (str)
 
    IP address to be used in masked headers to build valid SIP URIs. Can be
-   any IP address, does not affect routing when used on the main SIP
-   server.
+   any IP address, even a private-space IP address (e.g., 192.168.1.1),
+   but must not be SIP server's local IP address. It is not used at all
+   for SIP routing.
 
    Default value is "10.1.1.10".
 

modules/topoh/doc/topoh_admin.xml

@@ -89,8 +89,9 @@ modparam("topoh", "mask_key", "some secret here")
 		<title><varname>mask_ip</varname> (str)</title>
 		<para>
 		IP address to be used in masked headers to build valid
-		SIP URIs. Can be any IP address, does not affect routing
-		when used on the main SIP server.
+		SIP URIs. Can be any IP address, even a private-space IP address
+		(e.g., 192.168.1.1), but must not be SIP server's local IP address.
+		It is not used at all for SIP routing.
 		</para>
 		<para>
 		<emphasis>