diff --git a/doc/tex/cdrdriver.tex b/doc/tex/cdrdriver.tex
index 7865958c19..578aa5c604 100644
--- a/doc/tex/cdrdriver.tex
+++ b/doc/tex/cdrdriver.tex
@@ -260,18 +260,34 @@ SQLite version 2 is supported in cdr\_sqlite.
 	\item Asterisk PBX
 \end{itemize}
 
-\begin{verbatim}
-	+--------------------+
-	|    Asterisk PBX    |
-	|                    |
-	|********************|
-	|                    |        +---------------+
-	|    RADIUS client   |------->| RADIUS server |
-	|                    |<-------| (FreeRADIUS)  |
-	+--------------------+        +---------------+
-\end{verbatim}
-
-
+\begin{figure}[h]
+\begin{center}
+\setlength{\unitlength}{4cm}
+\begin{picture}(3,.75)
+\put(0,0){\line(0,1){.75}}
+\put(0,.75){\line(1,0){1.5}}
+\put(1.5,0){\line(0,1){.75}}
+\put(0,0){\line(1,0){1.5}}
+\put(.1,.4){\makebox(1.3,.3){Asterisk PBX}}
+\put(.1,.4){\line(1,0){1.3}}
+\put(.1,.1){\line(1,0){1.3}}
+\put(.1,.1){\line(0,1){.3}}
+\put(1.4,.1){\line(0,1){.3}}
+\put(.1,.1){\makebox(1.3,.3){RADIUS Client}}
+\put(1.8,0){\line(0,1){.5}}
+\put(1.8,.5){\line(1,0){1.1}}
+\put(1.8,0){\line(1,0){1.1}}
+\put(2.9,0){\line(0,1){.5}}
+\put(1.8,.275){\makebox(1.1,.1){RADIUS Server}}
+\put(1.8,.125){\makebox(1.1,.1){$(FreeRADIUS)$}}
+\thicklines
+\put(1.4,.3){\vector(1,0){.4}}
+\put(1.8,.2){\vector(-1,0){.4}}
+\thinlines
+\end{picture}
+\end{center}
+\caption{Asterisk/RADIUS Integration}
+\end{figure}
 
 \subsection{Steps to follow in order to have RADIUS support}