diff --git a/extensions/rt_default/rtd_conf.y b/extensions/rt_default/rtd_conf.y
new file mode 100644
index 0000000..d6ed329
--- /dev/null
+++ b/extensions/rt_default/rtd_conf.y
@@ -0,0 +1,273 @@
+/*********************************************************************************************************
+* Software License Agreement (BSD License)                                                               *
+* Author: Sebastien Decugis <sdecugis@freediameter.net>							 *
+*													 *
+* Copyright (c) 2013, WIDE Project and NICT								 *
+* All rights reserved.											 *
+* 													 *
+* Redistribution and use of this software in source and binary forms, with or without modification, are  *
+* permitted provided that the following conditions are met:						 *
+* 													 *
+* * Redistributions of source code must retain the above 						 *
+*   copyright notice, this list of conditions and the 							 *
+*   following disclaimer.										 *
+*    													 *
+* * Redistributions in binary form must reproduce the above 						 *
+*   copyright notice, this list of conditions and the 							 *
+*   following disclaimer in the documentation and/or other						 *
+*   materials provided with the distribution.								 *
+* 													 *
+* * Neither the name of the WIDE Project or NICT nor the 						 *
+*   names of its contributors may be used to endorse or 						 *
+*   promote products derived from this software without 						 *
+*   specific prior written permission of WIDE Project and 						 *
+*   NICT.												 *
+* 													 *
+* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED *
+* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A *
+* PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR *
+* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 	 *
+* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 	 *
+* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR *
+* TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF   *
+* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.								 *
+*********************************************************************************************************/
+
+/* Yacc extension's configuration parser.
+ * See doc/rt_default.conf.sample for configuration file format
+ */
+
+/* For development only : */
+%debug 
+%error-verbose
+
+/* The parser receives the configuration file filename as parameter */
+%parse-param {char * conffile}
+
+/* Keep track of location */
+%locations 
+%pure-parser
+
+%{
+#include "rt_default.h"
+#include "rtd_conf.tab.h"	/* bison is not smart enough to define the YYLTYPE before including this code, so... */
+
+/* Forward declaration */
+int yyparse(char * conffile);
+
+static int rules_added = 0;
+
+/* Parse the configuration file */
+int rtd_conf_handle(char * conffile)
+{
+	extern FILE * rtd_confin;
+	int ret;
+	
+	TRACE_ENTRY("%p", conffile);
+	
+	TRACE_DEBUG (FULL, "Parsing configuration file: %s...", conffile);
+	
+	rtd_confin = fopen(conffile, "r");
+	if (rtd_confin == NULL) {
+		ret = errno;
+		fd_log_debug("Unable to open extension configuration file %s for reading: %s", conffile, strerror(ret));
+		TRACE_DEBUG (INFO, "Error occurred, message logged -- configuration file.");
+		return ret;
+	}
+
+	ret = yyparse(conffile);
+
+	fclose(rtd_confin);
+
+	if (ret != 0) {
+		TRACE_DEBUG (INFO, "Unable to parse the configuration file.");
+		return EINVAL;
+	} else {
+		TRACE_DEBUG(FULL, "Added %d RULES routing entries successfully.", rules_added);
+	}
+	
+	return 0;
+}
+
+/* The Lex parser prototype */
+int rtd_conflex(YYSTYPE *lvalp, YYLTYPE *llocp);
+
+/* Function to report the errors */
+void yyerror (YYLTYPE *ploc, char * conffile, char const *s)
+{
+	TRACE_DEBUG(INFO, "Error in configuration parsing");
+	
+	if (ploc->first_line != ploc->last_line)
+		fd_log_debug("%s:%d.%d-%d.%d : %s", conffile, ploc->first_line, ploc->first_column, ploc->last_line, ploc->last_column, s);
+	else if (ploc->first_column != ploc->last_column)
+		fd_log_debug("%s:%d.%d-%d : %s", conffile, ploc->first_line, ploc->first_column, ploc->last_column, s);
+	else
+		fd_log_debug("%s:%d.%d : %s", conffile, ploc->first_line, ploc->first_column, s);
+}
+
+%}
+
+/* Values returned by lex for token */
+%union {
+	int		 integer;	/* Store integer values */
+	char 		*string;	/* The string is allocated by strdup in lex.*/
+	struct {
+		char * str;
+		int regex;
+	}		 tstring;	/* typed string */
+	struct {
+		char * str;
+		int    regex;
+		enum rtd_crit_type type;
+	}		 criteria;
+	struct {
+		char * str;
+		int    regex;
+		enum rtd_targ_type type;
+	}		 target;
+}
+
+/* In case of error in the lexical analysis */
+%token 		LEX_ERROR
+
+/* A (de)quoted string (malloc'd in lex parser; it must be freed after use) */
+%token <string>	QSTRING
+/* A (de)bracket-quoted string (malloc'd in lex parser; it must be freed after use): ["blahblah"] */
+%token <string>	BQSTRING
+
+/* An integer value */
+%token <integer> INTEGER
+
+/* The types for this gramar */
+%type <tstring>  TSTRING
+%type <criteria> CRITERIA
+%type <target> 	 TARGET
+%type <integer>  EXPR_INT
+
+/* Tokens */
+%token 		OH
+%token 		OR
+%token 		DH
+%token 		DR
+%token 		UN
+%token 		SI
+
+%token 		REALM
+
+
+
+/* -------------------------------------- */
+%%
+
+	/* The grammar definition */
+conffile:		/* empty grammar is OK */
+			| conffile rule
+			;
+			
+	/* a RULE entry */
+rule:			CRITERIA ':' TARGET '+' '=' EXPR_INT ';'
+			{
+				int flag = 0;
+				if ($1.regex)
+					flag |= RTD_CRIT_REG;
+				if ($3.regex)
+					flag |= RTD_TARG_REG;
+					
+				/* Add this rule to the repository */
+				CHECK_FCT_DO( rtd_add($1.type, $1.str, $3.type, $3.str, $6, flag),
+					{
+						yyerror (&yylloc, conffile, "An error occurred while adding a rule, aborting...");
+						YYERROR;
+					} );
+				
+				rules_added++;
+			}
+			;
+	
+	/* QSTRING and BQSTRING are equivalent in the grammar */
+TSTRING:		QSTRING
+			{
+				$$.str = $1;
+				$$.regex = 0;
+			}
+			| BQSTRING
+			{
+				$$.str = $1;
+				$$.regex = 1;
+			}
+			;
+
+	/* Details of the CRITERIA type */
+CRITERIA:		'*'
+			{
+				$$.str = NULL;
+				$$.regex = 0;
+				$$.type = RTD_CRI_ALL;
+			}
+			| OH '=' TSTRING
+			{
+				$$.str = $3.str;
+				$$.regex =$3.regex;
+				$$.type = RTD_CRI_OH;
+			}
+			| OR '=' TSTRING
+			{
+				$$.str = $3.str;
+				$$.regex =$3.regex;
+				$$.type = RTD_CRI_OR;
+			}
+			| DH '=' TSTRING
+			{
+				$$.str = $3.str;
+				$$.regex =$3.regex;
+				$$.type = RTD_CRI_DH;
+			}
+			| DR '=' TSTRING
+			{
+				$$.str = $3.str;
+				$$.regex =$3.regex;
+				$$.type = RTD_CRI_DR;
+			}
+			| UN '=' TSTRING
+			{
+				$$.str = $3.str;
+				$$.regex =$3.regex;
+				$$.type = RTD_CRI_UN;
+			}
+			| SI '=' TSTRING
+			{
+				$$.str = $3.str;
+				$$.regex =$3.regex;
+				$$.type = RTD_CRI_SI;
+			}
+			;
+
+	/* Details of the TARGET type */
+TARGET:			TSTRING
+			{
+				$$.str = $1.str;
+				$$.regex =$1.regex;
+				$$.type = RTD_TAR_ID;
+			}
+			| REALM '=' TSTRING
+			{
+				$$.str = $3.str;
+				$$.regex =$3.regex;
+				$$.type = RTD_TAR_REALM;
+			}
+			;
+	
+	/* An expression that has an integer value; we allow + and - operators cause it is convenient */
+EXPR_INT:		INTEGER
+			{
+				$$ = $1;
+			}
+			| EXPR_INT '+' INTEGER
+			{
+				$$ = $1 + $3;
+			}
+			| EXPR_INT '-' INTEGER
+			{
+				$$ = $1 - $3;
+			}
+			;