diff --git a/asterisk/SIP_ConnectionHandler.ttcn b/asterisk/SIP_ConnectionHandler.ttcn
index a14dd03..cd50be6 100644
--- a/asterisk/SIP_ConnectionHandler.ttcn
+++ b/asterisk/SIP_ConnectionHandler.ttcn
@@ -296,10 +296,10 @@
 	as_SIP_expect_resp(exp);
 
 	/* Digest Auth: RFC 2617 */
-	authorization := f_sip_digest_gen_Authorization(g_rx_sip_resp.msgHeader.wwwAuthenticate,
-							g_pars.user, g_pars.password,
-							"REGISTER",
-							f_sip_SipUrl_to_str(g_pars.registrar_sip_req_uri))
+	authorization := f_sip_digest_gen_Authorization_MD5(g_rx_sip_resp.msgHeader.wwwAuthenticate,
+							    g_pars.user, g_pars.password,
+							    "REGISTER",
+							    f_sip_SipUrl_to_str(g_pars.registrar_sip_req_uri))
 
 	/* New transaction: */
 	g_pars.registrar_sip_seq_nr := g_pars.registrar_sip_seq_nr + 1;
@@ -381,7 +381,7 @@
 	as_SIP_expect_resp(exp);
 
 	/* Digest Auth: RFC 2617 */
-	req.msgHeader.authorization := f_sip_digest_gen_Authorization(
+	req.msgHeader.authorization := f_sip_digest_gen_Authorization_MD5(
 						g_rx_sip_resp.msgHeader.wwwAuthenticate,
 						g_pars.user, g_pars.password,
 						"INVITE",