diff --git a/src/include/switch_loadable_module.h b/src/include/switch_loadable_module.h
index 31f7a273d0..ce67bcf613 100644
--- a/src/include/switch_loadable_module.h
+++ b/src/include/switch_loadable_module.h
@@ -171,10 +171,10 @@ SWITCH_DECLARE(switch_directory_interface_t *) switch_loadable_module_get_direct
   \param arraylen the max size in elements of the array
   \return the number of elements added to the array
  */
-SWITCH_DECLARE(int) switch_loadable_module_get_codecs(switch_memory_pool_t *pool, 
-													  switch_codec_interface_t **array, 
+SWITCH_DECLARE(int) switch_loadable_module_get_codecs(switch_memory_pool_t *pool, const switch_codec_implementation_t **array,
 													  int arraylen);
 
+
 /*!
   \brief Retrieve the list of loaded codecs into an array based on another array showing the sorted order
   \param array the array to populate
@@ -184,10 +184,8 @@ SWITCH_DECLARE(int) switch_loadable_module_get_codecs(switch_memory_pool_t *pool
   \return the number of elements added to the array
   \note this function only considers codecs that are listed in the "prefs" array and ignores the rest.
 */
-SWITCH_DECLARE(int) switch_loadable_module_get_codecs_sorted(switch_codec_interface_t **array,
-															 int arraylen, 
-															 char **prefs, 
-															 int preflen);
+SWITCH_DECLARE(int) switch_loadable_module_get_codecs_sorted(const switch_codec_implementation_t **array,
+															 int arraylen, char **prefs, int preflen);
 
 /*!
   \brief Execute a registered API command
diff --git a/src/include/switch_module_interfaces.h b/src/include/switch_module_interfaces.h
index ecee1353d2..f9fd792ff6 100644
--- a/src/include/switch_module_interfaces.h
+++ b/src/include/switch_module_interfaces.h
@@ -444,6 +444,8 @@ struct switch_codec {
 
 /*! \brief A table of settings and callbacks that define a paticular implementation of a codec */
 struct switch_codec_implementation {
+	/*! enumeration defining the type of the codec */
+	const switch_codec_type_t codec_type;
 	/*! the IANA code number */
 	switch_payload_t ianacode;
 	/*! the IANA code name */
@@ -497,8 +499,6 @@ struct switch_codec_implementation {
 struct switch_codec_interface {
 	/*! the name of the interface */
 	const char *interface_name;
-	/*! enumeration defining the type of the codec */
-	const switch_codec_type_t codec_type;
 	/*! a list of codec implementations related to the codec */
 	const switch_codec_implementation_t *implementations;
 	const struct switch_codec_interface *next;
diff --git a/src/mod/codecs/mod_g711/mod_g711.c b/src/mod/codecs/mod_g711/mod_g711.c
index 3fc5a6cd49..98a115d545 100644
--- a/src/mod/codecs/mod_g711/mod_g711.c
+++ b/src/mod/codecs/mod_g711/mod_g711.c
@@ -190,6 +190,7 @@ static switch_status_t switch_g711a_destroy(switch_codec_t *codec)
 #if 0
 
 static const switch_codec_implementation_t g711u_8k_60ms_implementation = {
+	/*.codec_type */ SWITCH_CODEC_TYPE_AUDIO,
 	/*.ianacode */ 0,
 	/*.iananame */ "PCMU",
 	/*.samples_per_second */ 8000,
@@ -206,9 +207,10 @@ static const switch_codec_implementation_t g711u_8k_60ms_implementation = {
 	/*.decode */ switch_g711u_decode,
 	/*.destroy */ switch_g711u_destroy
 };
-
+#endif
 
 static const switch_codec_implementation_t g711u_8k_30ms_implementation = {
+	/*.codec_type */ SWITCH_CODEC_TYPE_AUDIO,
 	/*.ianacode */ 0,
 	/*.iananame */ "PCMU",
 	/*.samples_per_second */ 8000,
@@ -224,11 +226,11 @@ static const switch_codec_implementation_t g711u_8k_30ms_implementation = {
 	/*.encode */ switch_g711u_encode,
 	/*.decode */ switch_g711u_decode,
 	/*.destroy */ switch_g711u_destroy,
-	/*.next */ &g711u_8k_60ms_implementation
+	/*.next */ NULL
 };
-#endif
 
 static const switch_codec_implementation_t g711u_16k_implementation = {
+	/*.codec_type */ SWITCH_CODEC_TYPE_AUDIO,
 	/*.ianacode */ 0,
 	/*.iananame */ "PCMU",
 	/*.samples_per_second */ 16000,
@@ -244,9 +246,11 @@ static const switch_codec_implementation_t g711u_16k_implementation = {
 	/*.encode */ switch_g711u_encode,
 	/*.decode */ switch_g711u_decode,
 	/*.destroy */ switch_g711u_destroy,
+	/*.next */ &g711u_8k_30ms_implementation
 };
 
 static const switch_codec_implementation_t g711u_8k_implementation = {
+	/*.codec_type */ SWITCH_CODEC_TYPE_AUDIO,
 	/*.ianacode */ 0,
 	/*.iananame */ "PCMU",
 	/*.samples_per_second */ 8000,
@@ -267,6 +271,7 @@ static const switch_codec_implementation_t g711u_8k_implementation = {
 
 
 static const switch_codec_implementation_t g711a_8k_implementation = {
+	/*.codec_type */ SWITCH_CODEC_TYPE_AUDIO,
 	/*.ianacode */ 8,
 	/*.iananame */ "PCMA",
 	/*.samples_per_second */ 8000,
@@ -287,13 +292,11 @@ static const switch_codec_implementation_t g711a_8k_implementation = {
 
 static const switch_codec_interface_t g711a_codec_interface = {
 	/*.interface_name */ "g711 alaw",
-	/*.codec_type */ SWITCH_CODEC_TYPE_AUDIO,
 	/*.implementations */ &g711a_8k_implementation
 };
 
 static const switch_codec_interface_t g711u_codec_interface = {
 	/*.interface_name */ "g711 ulaw",
-	/*.codec_type */ SWITCH_CODEC_TYPE_AUDIO,
 	/*.implementations */ &g711u_8k_implementation,
 	/*.next */ &g711a_codec_interface
 };
diff --git a/src/mod/codecs/mod_g729/mod_g729.c b/src/mod/codecs/mod_g729/mod_g729.c
index 99bee56909..9d6e98d65b 100644
--- a/src/mod/codecs/mod_g729/mod_g729.c
+++ b/src/mod/codecs/mod_g729/mod_g729.c
@@ -219,6 +219,7 @@ static switch_status_t switch_g729_decode(switch_codec_t *codec,
 /* Registration */ 
 
 static const switch_codec_implementation_t g729_10ms_8k_implementation = { 
+	/*.codec_type */ SWITCH_CODEC_TYPE_AUDIO, 
 	/*.ianacode */ 18, 
 	/*.iananame */ "G729", 
 	/*.samples_per_second */ 8000, 
@@ -237,6 +238,7 @@ static const switch_codec_implementation_t g729_10ms_8k_implementation = {
 };
 
 static const switch_codec_implementation_t g729_8k_implementation = { 
+	/*.codec_type */ SWITCH_CODEC_TYPE_AUDIO, 
 	/*.ianacode */ 18, 
 	/*.iananame */ "G729", 
 	/*.samples_per_second */ 8000, 
@@ -258,7 +260,6 @@ static const switch_codec_implementation_t g729_8k_implementation = {
 
 static const switch_codec_interface_t g729_codec_interface = { 
 	/*.interface_name */ "g729", 
-	/*.codec_type */ SWITCH_CODEC_TYPE_AUDIO, 
 	/*.implementations */ &g729_8k_implementation, 
 };
 
diff --git a/src/mod/codecs/mod_gsm/mod_gsm.c b/src/mod/codecs/mod_gsm/mod_gsm.c
index 7aef780074..ececdc1cbc 100644
--- a/src/mod/codecs/mod_gsm/mod_gsm.c
+++ b/src/mod/codecs/mod_gsm/mod_gsm.c
@@ -133,6 +133,7 @@ static switch_status_t switch_gsm_decode(switch_codec_t *codec, switch_codec_t *
 
 /* Registration */ 
 static const switch_codec_implementation_t gsm_8k_implementation = { 
+		/*.codec_type */ SWITCH_CODEC_TYPE_AUDIO, 
 		/*.ianacode */ 3, 
 		/*.iananame */ "gsm", 
 		/*.samples_per_second */ 8000, 
@@ -151,7 +152,6 @@ static const switch_codec_implementation_t gsm_8k_implementation = {
 };
 static const switch_codec_interface_t gsm_codec_interface = { 
 		/*.interface_name */ "gsm", 
-		/*.codec_type */ SWITCH_CODEC_TYPE_AUDIO, 
 		/*.implementations */ &gsm_8k_implementation, 
 };
 static switch_loadable_module_interface_t gsm_module_interface = { 
diff --git a/src/mod/codecs/mod_ilbc/mod_ilbc.c b/src/mod/codecs/mod_ilbc/mod_ilbc.c
index 49d38d4494..0721c0566e 100644
--- a/src/mod/codecs/mod_ilbc/mod_ilbc.c
+++ b/src/mod/codecs/mod_ilbc/mod_ilbc.c
@@ -186,6 +186,7 @@ static switch_status_t switch_ilbc_decode(switch_codec_t *codec,
 /* Registration */ 
 
 static const switch_codec_implementation_t ilbc_8k_30ms_implementation = { 
+		/*.codec_type */ SWITCH_CODEC_TYPE_AUDIO, 
 		/*.ianacode */ 97, 
 		/*.iananame */ "iLBC", 
 		/*.samples_per_second */ 8000, 
@@ -204,6 +205,7 @@ static const switch_codec_implementation_t ilbc_8k_30ms_implementation = {
 };
 
 static const switch_codec_implementation_t ilbc_8k_20ms_implementation = { 
+		/*.codec_type */ SWITCH_CODEC_TYPE_AUDIO, 
 		/*.ianacode */ 97, 
 		/*.iananame */ "iLBC", 
 		/*.samples_per_second */ 8000, 
@@ -225,6 +227,7 @@ static const switch_codec_implementation_t ilbc_8k_20ms_implementation = {
 
 
 static const switch_codec_implementation_t ilbc_102_8k_30ms_implementation = { 
+		/*.codec_type */ SWITCH_CODEC_TYPE_AUDIO, 
 		/*.ianacode */ 102, 
 		/*.iananame */ "iLBC", 
 		/*.samples_per_second */ 8000, 
@@ -243,6 +246,7 @@ static const switch_codec_implementation_t ilbc_102_8k_30ms_implementation = {
 };
 
 static const switch_codec_implementation_t ilbc_102_8k_20ms_implementation = { 
+		/*.codec_type */ SWITCH_CODEC_TYPE_AUDIO, 
 		/*.ianacode */ 102, 
 		/*.iananame */ "iLBC102", 
 		/*.samples_per_second */ 8000, 
@@ -263,6 +267,7 @@ static const switch_codec_implementation_t ilbc_102_8k_20ms_implementation = {
 
 
 static const switch_codec_implementation_t ilbc_8k_20ms_nonext_implementation = { 
+		/*.codec_type */ SWITCH_CODEC_TYPE_AUDIO, 
 		/*.ianacode */ 97, 
 		/*.iananame */ "iLBC20ms",
 		/*.samples_per_second */ 8000, 
@@ -283,20 +288,17 @@ static const switch_codec_implementation_t ilbc_8k_20ms_nonext_implementation =
 
 static const switch_codec_interface_t ilbc_20ms_codec_interface = { 
 		/*.interface_name */ "ilbc", 
-		/*.codec_type */ SWITCH_CODEC_TYPE_AUDIO, 
 		/*.implementations */ &ilbc_8k_20ms_nonext_implementation
 };
 
 static const switch_codec_interface_t ilbc_102_codec_interface = { 
 		/*.interface_name */ "ilbc", 
-		/*.codec_type */ SWITCH_CODEC_TYPE_AUDIO, 
 		/*.implementations */ &ilbc_102_8k_20ms_implementation, 
 		/*.next*/ &ilbc_20ms_codec_interface
 };
 
 static const switch_codec_interface_t ilbc_codec_interface = { 
 		/*.interface_name */ "ilbc", 
-		/*.codec_type */ SWITCH_CODEC_TYPE_AUDIO, 
 		/*.implementations */ &ilbc_8k_20ms_implementation, 
 		/*.next*/ &ilbc_102_codec_interface
 };
diff --git a/src/mod/codecs/mod_l16/mod_l16.c b/src/mod/codecs/mod_l16/mod_l16.c
index ca544e4a39..bcf43d9ece 100644
--- a/src/mod/codecs/mod_l16/mod_l16.c
+++ b/src/mod/codecs/mod_l16/mod_l16.c
@@ -90,6 +90,7 @@ static switch_status_t switch_raw_destroy(switch_codec_t *codec)
 }
 
 static const switch_codec_implementation_t raw_32k_implementation = {
+	/*.codec_type */ SWITCH_CODEC_TYPE_AUDIO,
 	/*.ianacode */ 10,
 	/*.iananame */ "L16",
 	/*.samples_per_second = */ 32000,
@@ -108,6 +109,7 @@ static const switch_codec_implementation_t raw_32k_implementation = {
 };
 
 static const switch_codec_implementation_t raw_22k_implementation = {
+	/*.codec_type */ SWITCH_CODEC_TYPE_AUDIO,
 	/*.ianacode */ 10,
 	/*.iananame */ "L16",
 	/*.samples_per_second = */ 22050,
@@ -127,6 +129,7 @@ static const switch_codec_implementation_t raw_22k_implementation = {
 };
 
 static const switch_codec_implementation_t raw_16k_implementation = {
+	/*.codec_type */ SWITCH_CODEC_TYPE_AUDIO,
 	/*.ianacode */ 10,
 	/*.iananame */ "L16",
 	/*.samples_per_second = */ 16000,
@@ -146,6 +149,7 @@ static const switch_codec_implementation_t raw_16k_implementation = {
 };
 
 static const switch_codec_implementation_t raw_8k_implementation = {
+	/*.codec_type */ SWITCH_CODEC_TYPE_AUDIO,
 	/*.ianacode */ 10,
 	/*.iananame */ "L16",
 	/*.samples_per_second = */ 8000,
@@ -166,6 +170,7 @@ static const switch_codec_implementation_t raw_8k_implementation = {
 
 
 static const switch_codec_implementation_t raw_8k_30ms_implementation = {
+	/*.codec_type */ SWITCH_CODEC_TYPE_AUDIO,
 	/*.ianacode */ 10,
 	/*.iananame */ "L16",
 	/*.samples_per_second */ 8000,
@@ -186,6 +191,7 @@ static const switch_codec_implementation_t raw_8k_30ms_implementation = {
 
 
 static const switch_codec_implementation_t raw_8k_60ms_implementation = {
+	/*.codec_type */ SWITCH_CODEC_TYPE_AUDIO,
 	/*.ianacode */ 10,
 	/*.iananame */ "L16",
 	/*.samples_per_second */ 8000,
@@ -205,6 +211,7 @@ static const switch_codec_implementation_t raw_8k_60ms_implementation = {
 };
 
 static const switch_codec_implementation_t raw_8k_120ms_implementation = {
+	/*.codec_type */ SWITCH_CODEC_TYPE_AUDIO,
 	/*.ianacode */ 10,
 	/*.iananame */ "L16",
 	/*.samples_per_second */ 8000,
@@ -226,7 +233,6 @@ static const switch_codec_implementation_t raw_8k_120ms_implementation = {
 
 static const switch_codec_interface_t raw_codec_interface = {
 	/*.interface_name */ "raw signed linear (16 bit)",
-	/*.codec_type */ SWITCH_CODEC_TYPE_AUDIO,
 	/*.implementations */ &raw_8k_120ms_implementation
 };
 
diff --git a/src/mod/codecs/mod_speex/mod_speex.c b/src/mod/codecs/mod_speex/mod_speex.c
index cf8461df93..a7921cc94d 100644
--- a/src/mod/codecs/mod_speex/mod_speex.c
+++ b/src/mod/codecs/mod_speex/mod_speex.c
@@ -268,6 +268,7 @@ static switch_status_t switch_speex_destroy(switch_codec_t *codec)
 
 /* Registration */
 static const switch_codec_implementation_t speex_32k_implementation = {
+	/*.codec_type */ SWITCH_CODEC_TYPE_AUDIO,
 	/*.ianacode */ 98,
 	/*.iananame */ "speex",
 	/*.samples_per_second */ 32000,
@@ -286,6 +287,7 @@ static const switch_codec_implementation_t speex_32k_implementation = {
 };
 
 static const switch_codec_implementation_t speex_16k_implementation = {
+	/*.codec_type */ SWITCH_CODEC_TYPE_AUDIO,
 	/*.ianacode */ 98,
 	/*.iananame */ "speex",
 	/*.samples_per_second */ 16000,
@@ -305,6 +307,7 @@ static const switch_codec_implementation_t speex_16k_implementation = {
 };
 
 static const switch_codec_implementation_t speex_8k_implementation = {
+	/*.codec_type */ SWITCH_CODEC_TYPE_AUDIO,
 	/*.ianacode */ 98,
 	/*.iananame */ "speex",
 	/*.samples_per_second */ 8000,
@@ -325,7 +328,6 @@ static const switch_codec_implementation_t speex_8k_implementation = {
 
 static const switch_codec_interface_t speex_codec_interface = {
 	/*.interface_name */ "speex",
-	/*.codec_type */ SWITCH_CODEC_TYPE_AUDIO,
 	/*.implementations */ &speex_8k_implementation
 };
 
diff --git a/src/mod/endpoints/mod_dingaling/mod_dingaling.c b/src/mod/endpoints/mod_dingaling/mod_dingaling.c
index a599fc80ac..e11c4a13f8 100644
--- a/src/mod/endpoints/mod_dingaling/mod_dingaling.c
+++ b/src/mod/endpoints/mod_dingaling/mod_dingaling.c
@@ -113,7 +113,7 @@ struct private_object {
 	switch_caller_profile_t *caller_profile;
 	unsigned short samprate;
 	switch_mutex_t *mutex;
-	switch_codec_interface_t *codecs[SWITCH_MAX_CODECS];
+	const switch_codec_implementation_t *codecs[SWITCH_MAX_CODECS];
 	unsigned int num_codecs;
 	int codec_index;
 	switch_rtp_t *rtp_session;
@@ -440,16 +440,16 @@ static int do_describe(struct private_object *tech_pvt, int force)
 	if (force || !switch_test_flag(tech_pvt, TFLAG_CODEC_READY)) {
 		if (tech_pvt->codec_index < 0) {
 			switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_DEBUG, "Don't have my codec yet here's one\n");
-			tech_pvt->codec_name = lame(tech_pvt->codecs[0]->implementations->iananame);
-			tech_pvt->codec_num = tech_pvt->codecs[0]->implementations->ianacode;
+			tech_pvt->codec_name = lame(tech_pvt->codecs[0]->iananame);
+			tech_pvt->codec_num = tech_pvt->codecs[0]->ianacode;
 			tech_pvt->codec_index = 0;
 					
-			payloads[0].name = lame(tech_pvt->codecs[0]->implementations->iananame);
-			payloads[0].id = tech_pvt->codecs[0]->implementations->ianacode;
+			payloads[0].name = lame(tech_pvt->codecs[0]->iananame);
+			payloads[0].id = tech_pvt->codecs[0]->ianacode;
 			
 		} else {
-			payloads[0].name = lame(tech_pvt->codecs[tech_pvt->codec_index]->implementations->iananame);
-			payloads[0].id = tech_pvt->codecs[tech_pvt->codec_index]->implementations->ianacode;
+			payloads[0].name = lame(tech_pvt->codecs[tech_pvt->codec_index]->iananame);
+			payloads[0].id = tech_pvt->codecs[tech_pvt->codec_index]->ianacode;
 		}
 
 				
@@ -1546,22 +1546,22 @@ static ldl_status handle_signalling(ldl_handle_t *handle, ldl_session_t *dlsessi
 				for(x = 0; x < len; x++) {
 					switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_DEBUG, "Available Payload %s %u\n", payloads[x].name, payloads[x].id);
 					for(y = 0; y < tech_pvt->num_codecs; y++) {
-						char *name = tech_pvt->codecs[y]->implementations->iananame;
+						char *name = tech_pvt->codecs[y]->iananame;
 
 						if (!strncasecmp(name, "ilbc", 4)) {
 							name = "ilbc";
 						}
-						if (tech_pvt->codecs[y]->implementations->ianacode > 96) {
+						if (tech_pvt->codecs[y]->ianacode > 96) {
 							match = strcasecmp(name, payloads[x].name) ? 0 : 1;
 						} else {
-							match = (payloads[x].id == tech_pvt->codecs[y]->implementations->ianacode) ? 1 : 0;
+							match = (payloads[x].id == tech_pvt->codecs[y]->ianacode) ? 1 : 0;
 						}
 						
 						if (match) {
 							tech_pvt->codec_index = y;
 							switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_DEBUG, "Choosing Payload index %u %s %u\n", y, payloads[x].name, payloads[x].id);
-							tech_pvt->codec_name = tech_pvt->codecs[y]->implementations->iananame;
-							tech_pvt->codec_num = tech_pvt->codecs[y]->implementations->ianacode;
+							tech_pvt->codec_name = tech_pvt->codecs[y]->iananame;
+							tech_pvt->codec_num = tech_pvt->codecs[y]->ianacode;
 							if (!switch_test_flag(tech_pvt, TFLAG_OUTBOUND)) {
 								do_describe(tech_pvt, 0);
 							}
diff --git a/src/mod/endpoints/mod_exosip/mod_exosip.c b/src/mod/endpoints/mod_exosip/mod_exosip.c
index 5c5ff3ec5a..7e76aca744 100644
--- a/src/mod/endpoints/mod_exosip/mod_exosip.c
+++ b/src/mod/endpoints/mod_exosip/mod_exosip.c
@@ -138,7 +138,7 @@ struct private_object {
 	int ssrc;
 	switch_time_t last_read;
 	char *realm;
-	switch_codec_interface_t *codecs[SWITCH_MAX_CODECS];
+	const switch_codec_implementation_t *codecs[SWITCH_MAX_CODECS];
 	int num_codecs;
 	switch_payload_t te;
 	switch_mutex_t *flag_mutex;
@@ -173,7 +173,13 @@ static switch_status_t exosip_read_frame(switch_core_session_t *session, switch_
 static switch_status_t exosip_write_frame(switch_core_session_t *session, switch_frame_t *frame, int timeout,
 										switch_io_flag_t flags, int stream_id);
 static int config_exosip(int reload);
-static switch_status_t parse_sdp_media(struct private_object *tech_pvt, sdp_media_t * media, char **dname, char **drate, char **dpayload);
+static switch_status_t parse_sdp_media(struct private_object *tech_pvt,
+									   sdp_media_t * media,
+									   char **dname,
+									   char **drate,
+									   char **dpayload,
+									   const switch_codec_implementation_t **impp);
+
 static switch_status_t exosip_kill_channel(switch_core_session_t *session, int sig);
 static switch_status_t activate_rtp(struct private_object *tech_pvt);
 static void deactivate_rtp(struct private_object *tech_pvt);
@@ -356,7 +362,7 @@ static switch_status_t exosip_on_init(switch_core_session_t *session)
 			static const switch_codec_implementation_t *imp;
 
 			for (i = 0; i < tech_pvt->num_codecs; i++) {
-				imp = tech_pvt->codecs[i]->implementations;
+				imp = tech_pvt->codecs[i];
 
 				while(NULL != imp) {
 					uint32_t sps = imp->samples_per_second;
@@ -1178,6 +1184,7 @@ static switch_status_t exosip_create_call(eXosip_event_t * event)
 		char *displayname, *username;
 		osip_header_t *tedious;
 		char *val;
+		const switch_codec_implementation_t *imp = NULL;
 
 		switch_core_session_add_stream(session, NULL);
 		if ((tech_pvt = (struct private_object *) switch_core_session_alloc(session, sizeof(struct private_object))) != 0) {
@@ -1310,10 +1317,10 @@ static switch_status_t exosip_create_call(eXosip_event_t * event)
 
 		if (tech_pvt->num_codecs > 0) {
 			int i;
-			static const switch_codec_implementation_t *imp;
+			static const switch_codec_implementation_t *imp = NULL;
 
 			for (i = 0; i < tech_pvt->num_codecs; i++) {
-				for (imp = tech_pvt->codecs[i]->implementations; imp; imp = imp->next) {
+				for (imp = tech_pvt->codecs[i]; imp; imp = imp->next) {
 					sdp_add_codec(tech_pvt->sdp_config, tech_pvt->codecs[i]->codec_type, imp->ianacode, imp->iananame,
 								  imp->samples_per_second, 0);
 
@@ -1341,7 +1348,7 @@ static switch_status_t exosip_create_call(eXosip_event_t * event)
 			for (pos = 0; audio_tab[pos] != NULL; pos++) {
 				osip_rfc3264_complete_answer(tech_pvt->sdp_config, remote_sdp, tech_pvt->local_sdp, audio_tab[pos],
 											 mline);
-				if (parse_sdp_media(tech_pvt, audio_tab[pos], &dname, &drate, &dpayload) == SWITCH_STATUS_SUCCESS) {
+				if (parse_sdp_media(tech_pvt, audio_tab[pos], &dname, &drate, &dpayload, &imp) == SWITCH_STATUS_SUCCESS) {
 					tech_pvt->payload_num = atoi(dpayload);					
 					goto done;
 				}
@@ -1381,6 +1388,12 @@ static switch_status_t exosip_create_call(eXosip_event_t * event)
 		{
 			int rate = atoi(drate);
 			int ms = globals.codec_ms;
+
+
+			if (imp) {
+				ms = imp->microseconds_per_frame / 1000;
+			}
+
 			if (!strcasecmp(dname, "ilbc")) {
 				ms = 30;
 			}
@@ -1487,13 +1500,19 @@ static void destroy_call_by_event(eXosip_event_t *event)
 
 }
 
-static switch_status_t parse_sdp_media(struct private_object *tech_pvt, sdp_media_t * media, char **dname, char **drate, char **dpayload)
+static switch_status_t parse_sdp_media(struct private_object *tech_pvt,
+									   sdp_media_t * media,
+									   char **dname,
+									   char **drate,
+									   char **dpayload,
+									   const switch_codec_implementation_t **impp)
 {
 	int pos = 0;
 	sdp_attribute_t *attr = NULL;
 	char *name, *payload, *rate;
 	switch_status_t status = SWITCH_STATUS_GENERR;
 	char workspace[512];
+	const switch_codec_implementation_t *imp = NULL;
 
 	while (osip_list_eol(media->a_attributes, pos) == 0) {
 		attr = (sdp_attribute_t *) osip_list_get(media->a_attributes, pos);
@@ -1523,10 +1542,8 @@ static switch_status_t parse_sdp_media(struct private_object *tech_pvt, sdp_medi
 			}
 
 			for(i = 0; !match && i < tech_pvt->num_codecs; i++) {
-				const switch_codec_implementation_t *imp;
-				
-				
-				for (imp = tech_pvt->codecs[i]->implementations; imp; imp = imp->next) {
+
+				for (imp = tech_pvt->codecs[i]; imp; imp = imp->next) {
 
 					if (pt < 97) {
 						match = (pt == imp->ianacode) ? 1 : 0;
@@ -1545,6 +1562,7 @@ static switch_status_t parse_sdp_media(struct private_object *tech_pvt, sdp_medi
 				*dname = strdup(name);
 				*drate = strdup(rate);
 				*dpayload = strdup(payload);
+				*impp = imp;
 				switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_INFO, "Found negotiated codec Payload: %s Name: %s Rate: %s\n",
 								  *dpayload, *dname, *drate);	
 				return SWITCH_STATUS_SUCCESS;
@@ -1654,7 +1672,7 @@ static void handle_answer(eXosip_event_t * event)
 	struct private_object *tech_pvt;
 	char *dpayload = NULL, *dname = NULL, *drate = NULL;
 	switch_channel_t *channel;
-
+	const switch_codec_implementation_t *imp = NULL;
 
 	if ((tech_pvt = get_pvt_by_call_id(event->cid)) == 0) {
 		switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_DEBUG, "cannot answer nonexistant call [%d]!\n", event->cid);
@@ -1686,22 +1704,25 @@ static void handle_answer(eXosip_event_t * event)
 	snprintf(tech_pvt->remote_sdp_audio_ip, 50, conn->c_addr);
 
 	/* Grab codec elements */
-	if (parse_sdp_media(tech_pvt, remote_med, &dname, &drate, &dpayload) == SWITCH_STATUS_SUCCESS) {
+	if (parse_sdp_media(tech_pvt, remote_med, &dname, &drate, &dpayload, &imp) == SWITCH_STATUS_SUCCESS) {
 		tech_pvt->payload_num = atoi(dpayload);
 	}
 
 	/* Assign them thar IDs */
 	tech_pvt->did = event->did;
 	tech_pvt->tid = event->tid;
-
-
 	{
 		int rate = atoi(drate);
 		int ms = globals.codec_ms;
+
 		if (!strcasecmp(dname, "ilbc")) {
 			ms = 30;
 		}
 
+		if (imp) {
+			ms = imp->microseconds_per_frame / 1000;
+		}
+
 		if (switch_core_codec_init(&tech_pvt->read_codec,
 								   dname,
 								   rate,
diff --git a/src/mod/endpoints/mod_iax/mod_iax.c b/src/mod/endpoints/mod_iax/mod_iax.c
index 213cb12a27..13ec157331 100644
--- a/src/mod/endpoints/mod_iax/mod_iax.c
+++ b/src/mod/endpoints/mod_iax/mod_iax.c
@@ -213,7 +213,7 @@ static switch_status_t iax_set_codec(struct private_object *tech_pvt, struct iax
 	//int rate = 8000;
 	//int codec_ms = 20;
 	switch_channel_t *channel;
-	switch_codec_interface_t *codecs[SWITCH_MAX_CODECS];
+	const switch_codec_implementation_t *codecs[SWITCH_MAX_CODECS];
 	int num_codecs = 0;
 	unsigned int local_cap = 0, mixed_cap = 0, chosen = 0, leading = 0;
 	int x, srate = 8000;
@@ -235,7 +235,7 @@ static switch_status_t iax_set_codec(struct private_object *tech_pvt, struct iax
 
 	for (x = 0; x < num_codecs; x++) {
 		static const switch_codec_implementation_t *imp;
-		for (imp = codecs[x]->implementations; imp; imp = imp->next) {
+		for (imp = codecs[x]; imp; imp = imp->next) {
 			unsigned int codec = iana2ast(imp->ianacode);
 		
 			if (io == IAX_QUERY) {
@@ -251,7 +251,7 @@ static switch_status_t iax_set_codec(struct private_object *tech_pvt, struct iax
 		mixed_cap = local_cap;
 	}
 
-	leading = iana2ast(codecs[0]->implementations->ianacode);
+	leading = iana2ast(codecs[0]->ianacode);
 	if (io == IAX_QUERY) {
 		chosen = leading;
 		*format = chosen;
@@ -263,7 +263,7 @@ static switch_status_t iax_set_codec(struct private_object *tech_pvt, struct iax
 		return SWITCH_STATUS_SUCCESS;
 	} else if (switch_test_flag(&globals, GFLAG_MY_CODEC_PREFS) && (leading & mixed_cap)) {
 		chosen = leading;
-		dname = codecs[0]->implementations->iananame;
+		dname = codecs[0]->iananame;
 	} else {
 		unsigned int prefs[32];
 		int len = 0;
@@ -288,7 +288,7 @@ static switch_status_t iax_set_codec(struct private_object *tech_pvt, struct iax
 					chosen = prefs[x];
 					for (z = 0; z < num_codecs; z++) {
 						static const switch_codec_implementation_t *imp;
-						for (imp = codecs[z]->implementations; imp; imp = imp->next) {
+						for (imp = codecs[z]; imp; imp = imp->next) {
 							if (prefs[x] == iana2ast(imp->ianacode)) {
 								dname = imp->iananame;
 								break;
@@ -303,7 +303,7 @@ static switch_status_t iax_set_codec(struct private_object *tech_pvt, struct iax
 				chosen = *format;
 				for (x = 0; x < num_codecs; x++) {
 					static const switch_codec_implementation_t *imp;
-					for (imp = codecs[x]->implementations; imp; imp = imp->next) {
+					for (imp = codecs[x]; imp; imp = imp->next) {
 						unsigned int cap = iana2ast(imp->ianacode);
 						if (cap == chosen) {
 							dname = imp->iananame;
@@ -314,7 +314,7 @@ static switch_status_t iax_set_codec(struct private_object *tech_pvt, struct iax
 			} else {			/* c'mon there has to be SOMETHING... */
 				for (x = 0; x < num_codecs; x++) {
 					static const switch_codec_implementation_t *imp;
-					for (imp = codecs[x]->implementations; imp; imp = imp->next) {
+					for (imp = codecs[x]; imp; imp = imp->next) {
 						unsigned int cap = iana2ast(imp->ianacode);
 						if (cap & mixed_cap) {
 							chosen = cap;
diff --git a/src/switch_loadable_module.c b/src/switch_loadable_module.c
index 475c6c79c4..da8fb9c930 100644
--- a/src/switch_loadable_module.c
+++ b/src/switch_loadable_module.c
@@ -633,16 +633,18 @@ SWITCH_DECLARE(switch_directory_interface_t *) switch_loadable_module_get_direct
 	return switch_core_hash_find(loadable_modules.directory_hash, name);
 }
 
-SWITCH_DECLARE(int) switch_loadable_module_get_codecs(switch_memory_pool_t *pool, switch_codec_interface_t **array,
+SWITCH_DECLARE(int) switch_loadable_module_get_codecs(switch_memory_pool_t *pool, const switch_codec_implementation_t **array,
 													  int arraylen)
 {
 	switch_hash_index_t *hi;
 	void *val;
+	switch_codec_interface_t *codec_interface;
 	int i = 0;
 
 	for (hi = switch_hash_first(pool, loadable_modules.codec_hash); hi; hi = switch_hash_next(hi)) {
 		switch_hash_this(hi, NULL, NULL, &val);
-		array[i++] = val;
+		codec_interface = (switch_codec_interface_t *) val;
+		array[i++] = codec_interface->implementations;
 		if (i > arraylen) {
 			break;
 		}
@@ -652,20 +654,44 @@ SWITCH_DECLARE(int) switch_loadable_module_get_codecs(switch_memory_pool_t *pool
 
 }
 
-SWITCH_DECLARE(int) switch_loadable_module_get_codecs_sorted(switch_codec_interface_t **array,
+SWITCH_DECLARE(int) switch_loadable_module_get_codecs_sorted(const switch_codec_implementation_t **array,
 															 int arraylen, char **prefs, int preflen)
 {
 	int x, i = 0;
 	switch_codec_interface_t *codec_interface;
+	const switch_codec_implementation_t *imp;
 
-	for (x = 0; x < preflen; x++) {
-		if ((codec_interface = switch_loadable_module_get_codec_interface(prefs[x])) != 0 ) {
-			array[i++] = codec_interface;
-			if (i > arraylen) {
-				break;
+    for (x = 0; x < preflen; x++) {
+        char *name, *p, buf[128];
+        uint32_t interval = 0, len = 0;
+
+        name = prefs[x];
+        if ((p = strchr(name, '@'))) {
+            p++;
+            len = p-name;
+
+            if (len > sizeof(buf)) {
+                len = sizeof(buf);
+            }
+            switch_copy_string(buf, name, len);
+            *(buf + len) = '\0';
+            interval = atoi(p);
+            name = buf;
+        }
+
+        if ((codec_interface = switch_loadable_module_get_codec_interface(name)) != 0 ) {
+			for (imp = codec_interface->implementations; imp; imp = imp->next) {
+				if (!interval) {
+					array[i++] = imp;
+				} else if ((imp->microseconds_per_frame / 1000) == interval) {
+					array[i++] = imp;
+				}
 			}
-		}
-	}
+            if (i > arraylen) {
+                break;
+            }
+        }
+    }
 
 	return i;
 }