diff --git a/extensions/app_sip/app_sip.y b/extensions/app_sip/app_sip.y
new file mode 100644
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--- /dev/null
+++ b/extensions/app_sip/app_sip.y
@@ -0,0 +1,208 @@
+/*********************************************************************************************************
+* Software License Agreement (BSD License)                                                               *
+* Author: Alexandre Westfahl <awestfahl@freediameter.net>						 *
+*													 *
+* Copyright (c) 2010, Alexandre Westfahl, Teraoka Laboratory (Keio University), and the WIDE Project. 	 *		
+*													 *
+* All rights reserved.											 *
+* Based on ta_conf.y  (Sebastien Decugis <sdecugis@freediameter.net>)					 *
+* 													 *
+* 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 Teraoka Laboratory nor the 							 *
+*   names of its contributors may be used to endorse or 						 *
+*   promote products derived from this software without 						 *
+*   specific prior written permission of Teraoka Laboratory 						 *
+*   													 *
+* 													 *
+* 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.								 *
+*********************************************************************************************************/
+
+
+
+/* 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 "app_sip.h"
+#include "app_sip.tab.h"	/* bison is not smart enough to define the YYLTYPE before including this code, so... */
+
+#include <string.h>
+#include <errno.h>
+
+/* Forward declaration */
+int yyparse(char * conffile);
+
+/* Parse the configuration file */
+int as_conf_handle(char * conffile)
+{
+	extern FILE * app_sipin;
+	int ret;
+	
+	TRACE_ENTRY("%p", conffile);
+	
+	TRACE_DEBUG (FULL, "Parsing configuration file: %s...", conffile);
+	
+	app_sipin = fopen(conffile, "r");
+	if (app_sipin == 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(app_sipin);
+
+	if (ret != 0) {
+		TRACE_DEBUG (INFO, "Unable to parse the configuration file.");
+		return EINVAL;
+	}
+	
+	return 0;
+}
+
+/* The Lex parser prototype */
+int app_siplex(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 {
+	char 		*string;	/* The string is allocated by strdup in lex.*/
+	int		 integer;		/* Store integer values */
+}
+
+/* In case of error in the lexical analysis */
+%token 		LEX_ERROR
+
+/* Key words */
+%token 		MODE
+%token 		DATASOURCE
+%token 		ASMYSQL_LOGIN
+%token 		ASMYSQL_PASSWORD
+%token 		ASMYSQL_DATABASE
+%token 		ASMYSQL_SERVER
+%token 		ASMYSQL_PORT
+%token 		RTR_PORT
+%token 		PPR_PORT
+
+/* Tokens and types for routing table definition */
+/* A (de)quoted string (malloc'd in lex parser; it must be freed after use) */
+%token <string>	QSTRING
+
+/* An integer value */
+%token <integer> INTEGER
+
+
+
+/* -------------------------------------- */
+%%
+
+	/* The grammar definition */
+conffile:		/* empty grammar is OK */
+			| conffile mode
+			| conffile datasource
+			| conffile mysql_login
+			| conffile mysql_password
+			| conffile mysql_database
+			| conffile mysql_server
+			| conffile mysql_port
+			| conffile rtr_port
+			| conffile ppr_port
+			;
+
+mode:			MODE '=' INTEGER ';'
+			{
+				as_conf->mode = $3;
+			}
+			;
+
+datasource:			DATASOURCE '=' INTEGER ';'
+			{
+				as_conf->datasource = $3;
+			}
+			;
+
+mysql_login:			ASMYSQL_LOGIN '=' QSTRING ';'
+			{
+				free(as_conf->mysql_login);
+				as_conf->mysql_login = $3;
+			}
+			;
+
+mysql_password:			ASMYSQL_PASSWORD '=' QSTRING ';'
+			{
+				free(as_conf->mysql_password);
+				as_conf->mysql_password = $3;
+			}
+			;
+
+mysql_database:			ASMYSQL_DATABASE '=' QSTRING ';'
+			{
+				free(as_conf->mysql_database);
+				as_conf->mysql_database = $3;
+			}
+			;
+
+mysql_server:		ASMYSQL_SERVER '=' QSTRING ';'
+			{
+				free(as_conf->mysql_server);
+				as_conf->mysql_server = $3;
+			}
+			;
+
+mysql_port:		ASMYSQL_PORT '=' INTEGER ';'
+			{
+				as_conf->mysql_port = (uint16_t)$3;
+			}
+			;
+rtr_port:		RTR_PORT '=' INTEGER ';'
+			{
+				as_conf->rtr_port = (uint16_t)$3;
+			}
+			;
+ppr_port:		PPR_PORT '=' INTEGER ';'
+			{
+				as_conf->ppr_port = (uint16_t)$3;
+			}
+			;