diff --git a/console/commands.c b/console/commands.c
index cb684511c..08a747e56 100644
--- a/console/commands.c
+++ b/console/commands.c
@@ -1591,7 +1591,8 @@ static void linphonec_codec_list(LinphoneCore *lc){
 	MSList *node;
 	for(node=config->audio_codecs;node!=NULL;node=ms_list_next(node)){
 		pt=(PayloadType*)(node->data);
-        linphonec_out("%2d: %s (%d) %s\n", index, pt->mime_type, pt->clock_rate, payload_type_enabled(pt) ? "enabled" : "disabled");
+        linphonec_out("%2d: %s (%d) %s\n", index, pt->mime_type, pt->clock_rate, 
+		    linphone_core_payload_type_enabled(lc,pt) ? "enabled" : "disabled");
 		index++;
 	}
 }
diff --git a/coreapi/Makefile.am b/coreapi/Makefile.am
index 166232448..2410f2d4e 100644
--- a/coreapi/Makefile.am
+++ b/coreapi/Makefile.am
@@ -15,16 +15,16 @@ lib_LTLIBRARIES=liblinphone.la
 
 liblinphone_la_SOURCES=\
 	linphonecore.c linphonecore.h private.h\
-	exevents.c exevents.h \
 	offeranswer.c offeranswer.h\
 	sal.c sal.h \
 	sal_eXosip2.c sal_eXosip2.h\
 	sal_eXosip2_sdp.c \
 	sal_eXosip2_presence.c \
+	callbacks.c \
+	exevents.c sdphandler.c\
 	misc.c  \
 	address.c \
 	enum.c enum.h \
-	sdphandler.c sdphandler.h \
 	presence.c \
 	proxy.c \
 	friend.c \
diff --git a/coreapi/exevents.c b/coreapi/exevents.c
index feebb9ea2..c5428bff6 100644
--- a/coreapi/exevents.c
+++ b/coreapi/exevents.c
@@ -464,7 +464,8 @@ int linphone_set_audio_offer(sdp_context_t *ctx)
 	elem=lc->codecs_conf.audio_codecs;
 	while(elem!=NULL){
 		codec=(PayloadType*) elem->data;
-		if (linphone_core_check_payload_type_usability(lc,codec) && payload_type_enabled(codec)){
+		if (linphone_core_check_payload_type_usability(lc,codec) && 
+		    linphone_core_payload_type_enabled(lc,codec)){
 			sdp_payload_init(&payload);
 			payload.a_rtpmap=ortp_strdup_printf("%s/%i/1",codec->mime_type,codec->clock_rate);
 			payload.pt=rtp_profile_get_payload_number_from_rtpmap(lc->local_profile,payload.a_rtpmap);
@@ -535,7 +536,8 @@ int linphone_set_video_offer(sdp_context_t *ctx)
 
 	for(elem=lc->codecs_conf.video_codecs;elem!=NULL;elem=ms_list_next(elem)){
 		codec=(PayloadType*) elem->data;
-		if (linphone_core_check_payload_type_usability(lc,codec) && payload_type_enabled(codec)){
+		if (linphone_core_check_payload_type_usability(lc,codec) && 
+		    linphone_core_payload_type_enabled(lc,codec)){
 			sdp_payload_t payload;
 			sdp_payload_init(&payload);
 			payload.line=1;
@@ -587,7 +589,7 @@ SupportLevel linphone_payload_is_supported(LinphoneCore *lc, sdp_payload_t *payl
 				ms_warning("payload %s is not usable",rtppayload->mime_type);
 				return Unsupported;
 			}
-			if ( !payload_type_enabled(rtppayload)) {
+			if ( !linphone_core_payload_type_enabled(lc,rtppayload)) {
 				ms_warning("payload %s is not enabled.",rtppayload->mime_type);
 				return Unsupported;
 			}
diff --git a/coreapi/linphonecore.c b/coreapi/linphonecore.c
index 3c46d92a0..19b4db9cf 100644
--- a/coreapi/linphonecore.c
+++ b/coreapi/linphonecore.c
@@ -3390,7 +3390,7 @@ void codecs_config_uninit(LinphoneCore *lc)
 		sprintf(key,"audio_codec_%i",index);
 		lp_config_set_string(lc->config,key,"mime",pt->mime_type);
 		lp_config_set_int(lc->config,key,"rate",pt->clock_rate);
-		lp_config_set_int(lc->config,key,"enabled",payload_type_enabled(pt));
+		lp_config_set_int(lc->config,key,"enabled",linphone_core_payload_type_enabled(lc,pt));
 		index++;
 	}
 	index=0;
@@ -3399,7 +3399,7 @@ void codecs_config_uninit(LinphoneCore *lc)
 		sprintf(key,"video_codec_%i",index);
 		lp_config_set_string(lc->config,key,"mime",pt->mime_type);
 		lp_config_set_int(lc->config,key,"rate",pt->clock_rate);
-		lp_config_set_int(lc->config,key,"enabled",payload_type_enabled(pt));
+		lp_config_set_int(lc->config,key,"enabled",linphone_core_payload_type_enabled(lc,pt));
 		lp_config_set_string(lc->config,key,"recv_fmtp",pt->recv_fmtp);
 		index++;
 	}
diff --git a/coreapi/linphonecore.h b/coreapi/linphonecore.h
index 05dd32203..140822f87 100644
--- a/coreapi/linphonecore.h
+++ b/coreapi/linphonecore.h
@@ -40,14 +40,6 @@ extern "C" {
 struct _MSSndCard;
 struct _LinphoneCore;
 
-bool_t payload_type_enabled(struct _PayloadType *pt);
-void payload_type_set_enable(struct _PayloadType *pt,int value);
-const char *payload_type_get_description(struct _PayloadType *pt);
-int payload_type_get_bitrate(PayloadType *pt);
-const char *payload_type_get_mime(PayloadType *pt);
-int payload_type_get_rate(PayloadType *pt);
-
-
 struct _LpConfig;
 
 typedef struct sip_config
@@ -726,6 +718,12 @@ const MSList *linphone_core_get_video_codecs(const LinphoneCore *lc);
 
 int linphone_core_set_video_codecs(LinphoneCore *lc, MSList *codecs);
 
+bool_t linphone_core_payload_type_enabled(LinphoneCore *lc, PayloadType *pt);
+
+int linphone_core_enable_payload_type(LinphoneCore *lc, PayloadType *pt, bool_t enable);
+
+const char *linphone_core_get_payload_type_description(LinphoneCore *lc, PayloadType *pt);
+
 bool_t linphone_core_check_payload_type_usability(LinphoneCore *lc, PayloadType *pt);
 
 int linphone_core_add_proxy_config(LinphoneCore *lc, LinphoneProxyConfig *config);
diff --git a/coreapi/misc.c b/coreapi/misc.c
index c2ba26297..9bdb90420 100644
--- a/coreapi/misc.c
+++ b/coreapi/misc.c
@@ -170,33 +170,42 @@ void check_sound_device(LinphoneCore *lc)
 #define RTP_HDR_SZ 12
 #define IP4_HDR_SZ 20   /*20 is the minimum, but there may be some options*/
 
-const char *payload_type_get_description(PayloadType *pt){
-	return _((const char *)pt->user_data);
-}
-
-void payload_type_set_enable(PayloadType *pt,int value)
+static void payload_type_set_enable(PayloadType *pt,int value)
 {
 	if ((value)!=0) payload_type_set_flag(pt,PAYLOAD_TYPE_ENABLED); \
 	else payload_type_unset_flag(pt,PAYLOAD_TYPE_ENABLED);
 }
 
-
-bool_t payload_type_enabled(PayloadType *pt) {
+static bool_t payload_type_enabled(PayloadType *pt) {
 	return (((pt)->flags & PAYLOAD_TYPE_ENABLED)!=0);
 }
 
-int payload_type_get_bitrate(PayloadType *pt)
-{
-	return pt->normal_bitrate;
-}
-const char *payload_type_get_mime(PayloadType *pt){
-	return pt->mime_type;
+bool_t linphone_core_payload_type_enabled(LinphoneCore *lc, PayloadType *pt){
+	if (ms_list_find(lc->codecs_conf.audio_codecs,pt) || ms_list_find(lc->codecs_conf.video_codecs,pt)){
+		return payload_type_enabled(pt);
+	}
+	ms_error("Getting enablement status of codec not in audio or video list of PayloadType !");
+	return FALSE;
 }
 
-int payload_type_get_rate(PayloadType *pt){
-	return pt->clock_rate;
+int linphone_core_enable_payload_type(LinphoneCore *lc, PayloadType *pt, bool_t enabled){
+	if (ms_list_find(lc->codecs_conf.audio_codecs,pt) || ms_list_find(lc->codecs_conf.video_codecs,pt)){
+		payload_type_set_enable(pt,enabled);
+		return 0;
+	}
+	ms_error("Enabling codec not in audio or video list of PayloadType !");
+	return -1;
 }
 
+const char *linphone_core_get_payload_type_description(LinphoneCore *lc, PayloadType *pt){
+	if (ms_filter_codec_supported(pt->mime_type)){
+		MSFilterDesc *desc=ms_filter_get_encoder(pt->mime_type);
+		return desc->text;
+	}
+	return NULL;
+}
+
+
 /*this function makes a special case for speex/8000.
 This codec is variable bitrate. The 8kbit/s mode is interesting when having a low upload bandwidth, but its quality
 is not very good. We 'd better use its 15kbt/s mode when we have enough bandwidth*/
diff --git a/gtk-glade/propertybox.c b/gtk-glade/propertybox.c
index cbc7b5c73..09af0709e 100644
--- a/gtk-glade/propertybox.c
+++ b/gtk-glade/propertybox.c
@@ -295,7 +295,7 @@ static void linphone_gtk_show_codecs(GtkTreeView *listview, const MSList *codecl
 		gchar *color;
 		const char *params="";
 		struct _PayloadType *pt=(struct _PayloadType *)elem->data;
-		if (payload_type_enabled(pt)) status=_("Enabled");
+		if (linphone_core_payload_type_enabled(linphone_gtk_get_core(),pt)) status=_("Enabled");
 		else status=_("Disabled");
 		if (linphone_core_check_payload_type_usability(linphone_gtk_get_core(),pt)) color="blue";
 		else color="red";
@@ -311,7 +311,7 @@ static void linphone_gtk_show_codecs(GtkTreeView *listview, const MSList *codecl
 					CODEC_PARAMS,params,
 					CODEC_PRIVDATA,(gpointer)pt,
 					CODEC_COLOR,(gpointer)color,
-					CODEC_INFO,(gpointer)payload_type_get_description(pt),
+					CODEC_INFO,(gpointer)linphone_core_get_payload_type_description(linphone_gtk_get_core(),pt),
 					-1);
 	}
 	
@@ -433,7 +433,7 @@ static void linphone_gtk_codec_set_enable(GtkWidget *button, gboolean enabled){
 	if (gtk_tree_selection_get_selected(sel,&mod,&iter)){
 		store=GTK_LIST_STORE(mod);
 		gtk_tree_model_get(mod,&iter,CODEC_PRIVDATA,&pt,-1);
-		payload_type_set_enable(pt,enabled);
+		linphone_core_enable_payload_type(linphone_gtk_get_core(),pt,enabled);
 		gtk_list_store_set(store,&iter,CODEC_STATUS, enabled ? _("Enabled") : _("Disabled"), -1);
 	}
 }