diff --git a/CMakeLists.txt b/CMakeLists.txt
index 502588d..836383e 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -6,11 +6,14 @@ option(ENABLE_TESTS "Enable tests" OFF)
 include(third_party/coreHTTP/httpFilePaths.cmake)
 include(third_party/coreMQTT/mqttFilePaths.cmake)
 
-include_directories(dist/include)
+include_directories(dist/include dist/include/cjson)
 
 link_directories(dist/lib)
 
 set(DEP_LIBS "srtp2" "usrsctp" "mbedtls" "mbedcrypto" "mbedx509" "cjson")
+# Extended debug information (symbols, source code, and macro definitions)
+set(CMAKE_C_FLAGS_DEBUG "${CMAKE_C_FLAGS_DEBUG} -g3")
+set(CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG} -g3")
 
 add_definitions("-Wunused-variable -Werror=sequence-point -Werror=pointer-sign -Werror=return-type -Werror=sizeof-pointer-memaccess -Wincompatible-pointer-types -DHTTP_DO_NOT_USE_CUSTOM_CONFIG -DMQTT_DO_NOT_USE_CUSTOM_CONFIG")
 
diff --git a/examples/sample/main.c b/examples/sample/main.c
index 443b3e3..4d420e6 100644
--- a/examples/sample/main.c
+++ b/examples/sample/main.c
@@ -26,9 +26,9 @@ static void onclose(void *user_data) {
 
 }
 
-static void onmessasge(char *msg, size_t len, void *user_data) {
+static void onmessage(char *msg, size_t len, void *user_data, uint16_t sid) {
 
-  printf("on message: %s", msg);
+  printf("on message: %d %s", sid, msg);
 
   if (strncmp(msg, "ping", 4) == 0) {
     printf(", send pong\n");
@@ -96,7 +96,7 @@ int main(int argc, char *argv[]) {
   peer_init();
   g_pc = peer_connection_create(&config);
   peer_connection_oniceconnectionstatechange(g_pc, onconnectionstatechange);
-  peer_connection_ondatachannel(g_pc, onmessasge, onopen, onclose);
+  peer_connection_ondatachannel(g_pc, onmessage, onopen, onclose);
 
   peer_signaling_join_channel((const char*)buf, g_pc);
 
diff --git a/src/config.h b/src/config.h
index c9d6ceb..e0d7096 100644
--- a/src/config.h
+++ b/src/config.h
@@ -35,7 +35,7 @@
 #define WHIP_PORT 443
 
 #define KEEPALIVE_CONNCHECK 0
-#define CONFIG_IPV6 0
+#define CONFIG_IPV6 1 
 // default use wifi interface
 #define IFR_NAME "w"
 
diff --git a/src/peer_connection.c b/src/peer_connection.c
index a9e05ef..91b7066 100644
--- a/src/peer_connection.c
+++ b/src/peer_connection.c
@@ -164,6 +164,11 @@ PeerConnectionState peer_connection_get_state(PeerConnection *pc) {
   return pc->state;
 }
 
+Sctp *peer_connection_get_sctp(PeerConnection *pc) {
+
+  return &pc->sctp;
+}
+
 PeerConnection* peer_connection_create(PeerConfiguration *config) {
 
   PeerConnection *pc = calloc(1, sizeof(PeerConnection));
@@ -250,17 +255,20 @@ int peer_connection_send_video(PeerConnection *pc, const uint8_t *buf, size_t le
 }
 
 int peer_connection_datachannel_send(PeerConnection *pc, char *message, size_t len) {
+  return peer_connection_datachannel_send_sid(pc, message, len, 0);
+}
+
+int peer_connection_datachannel_send_sid(PeerConnection *pc, char *message, size_t len, uint16_t sid) {
 
   if(!sctp_is_connected(&pc->sctp)) {
     LOGE("sctp not connected");
     return -1;
   }
 
-  if (buffer_push_tail(pc->data_rb, (const uint8_t*)message, len) < 0) {
-    buffer_clear(pc->data_rb);
-  }
-
-  return 0;
+  if (pc->config.datachannel == DATA_CHANNEL_STRING)
+    return sctp_outgoing_data(&pc->sctp, message, len, PPID_STRING, sid);
+  else
+    return sctp_outgoing_data(&pc->sctp, message, len, PPID_BINARY, sid);
 }
 
 static void peer_connection_state_new(PeerConnection *pc) {
@@ -402,9 +410,9 @@ int peer_connection_loop(PeerConnection *pc) {
       if (data) {
 
          if (pc->config.datachannel == DATA_CHANNEL_STRING)
-           sctp_outgoing_data(&pc->sctp, (char*)data, bytes, PPID_STRING);
+           sctp_outgoing_data(&pc->sctp, (char*)data, bytes, PPID_STRING, 0);
          else
-           sctp_outgoing_data(&pc->sctp, (char*)data, bytes, PPID_BINARY);
+           sctp_outgoing_data(&pc->sctp, (char*)data, bytes, PPID_BINARY, 0);
          buffer_pop_head(pc->data_rb);
       }
 
@@ -539,7 +547,7 @@ void peer_connection_oniceconnectionstatechange(PeerConnection *pc,
 }
 
 void peer_connection_ondatachannel(PeerConnection *pc,
- void (*onmessasge)(char *msg, size_t len, void *userdata),
+ void (*onmessage)(char *msg, size_t len, void *userdata, uint16_t sid),
  void (*onopen)(void *userdata),
  void (*onclose)(void *userdata)) {
 
@@ -547,7 +555,26 @@ void peer_connection_ondatachannel(PeerConnection *pc,
 
     sctp_onopen(&pc->sctp, onopen);
     sctp_onclose(&pc->sctp, onclose);
-    sctp_onmessage(&pc->sctp, onmessasge);
+    sctp_onmessage(&pc->sctp, onmessage);
   }
 }
 
+int peer_connection_lookup_sid(PeerConnection *pc, const char *label, uint16_t *sid) {
+    for (int i = 0; i < pc->sctp.stream_count; i++) {
+        if (strncmp(pc->sctp.stream_table[i].label, label, sizeof(pc->sctp.stream_table[i].label)) == 0) {
+            *sid = pc->sctp.stream_table[i].sid;
+            return 0;
+        }
+    }
+    return -1; // Not found
+}
+
+char *peer_connection_lookup_sid_label(PeerConnection *pc, uint16_t sid) {
+    for (int i = 0; i < pc->sctp.stream_count; i++) {
+        if (pc->sctp.stream_table[i].sid == sid) {
+            return pc->sctp.stream_table[i].label;
+        }
+    }
+    return NULL; // Not found
+}
+
diff --git a/src/peer_connection.h b/src/peer_connection.h
index 5454999..1b620e1 100644
--- a/src/peer_connection.h
+++ b/src/peer_connection.h
@@ -7,6 +7,7 @@
 
 #include <stdlib.h>
 #include <stdint.h>
+#include "sctp.h"
 
 #ifdef __cplusplus
 extern "C" {
@@ -77,6 +78,8 @@ const char* peer_connection_state_to_string(PeerConnectionState state);
 
 PeerConnectionState peer_connection_get_state(PeerConnection *pc);
 
+Sctp *peer_connection_get_sctp(PeerConnection *pc);
+
 PeerConnection* peer_connection_create(PeerConfiguration *config);
 
 void peer_connection_destroy(PeerConnection *pc);
@@ -92,6 +95,8 @@ int peer_connection_loop(PeerConnection *pc);
  */
 int peer_connection_datachannel_send(PeerConnection *pc, char *message, size_t len);
 
+int peer_connection_datachannel_send_sid(PeerConnection *pc, char *message, size_t len, uint16_t sid);
+
 int peer_connection_send_audio(PeerConnection *pc, const uint8_t *packet, size_t bytes);
 
 int peer_connection_send_video(PeerConnection *pc, const uint8_t *packet, size_t bytes);
@@ -134,10 +139,14 @@ void peer_connection_oniceconnectionstatechange(PeerConnection *pc,
  * @param[in] callback function when connection is closed
  */
 void peer_connection_ondatachannel(PeerConnection *pc,
- void (*onmessasge)(char *msg, size_t len, void *userdata),
+ void (*onmessage)(char *msg, size_t len, void *userdata, uint16_t sid),
  void (*onopen)(void *userdata),
  void (*onclose)(void *userdata));
 
+int peer_connection_lookup_sid(PeerConnection *pc, const char *label, uint16_t *sid);
+
+char *peer_connection_lookup_sid_label(PeerConnection *pc, uint16_t sid);
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/src/sctp.c b/src/sctp.c
index 8b6b5ec..1a8a472 100644
--- a/src/sctp.c
+++ b/src/sctp.c
@@ -15,6 +15,7 @@
 #define DATA_CHANNEL_PPID_BINARY_PARTIAL    52
 #define DATA_CHANNEL_PPID_BINARY            53
 #define DATA_CHANNEL_PPID_DOMSTRING_PARTIAL 54
+#define DATA_CHANNEL_OPEN                   0x03
 
 static const uint32_t crc32c_table[256] = {
     0x00000000L, 0xF26B8303L, 0xE13B70F7L, 0x1350F3F4L,
@@ -108,21 +109,22 @@ static int sctp_outgoing_data_cb(void *userdata, void *buf, size_t len, uint8_t
   return 0;
 }
 
-int sctp_outgoing_data(Sctp *sctp, char *buf, size_t len, SctpDataPpid ppid) {
+int sctp_outgoing_data(Sctp *sctp, char *buf, size_t len, SctpDataPpid ppid, uint16_t sid) {
 
 #ifdef HAVE_USRSCTP
+  int res;
   struct sctp_sendv_spa spa = {0};
 
   spa.sendv_flags = SCTP_SEND_SNDINFO_VALID;
 
-  spa.sendv_sndinfo.snd_sid = 0;
+  spa.sendv_sndinfo.snd_sid = sid;
   spa.sendv_sndinfo.snd_flags = SCTP_EOR;
   spa.sendv_sndinfo.snd_ppid = htonl(ppid);
 
-  if(usrsctp_sendv(sctp->sock, buf, len, NULL, 0, &spa, sizeof(spa), SCTP_SENDV_SPA, 0) < 0) {
-    LOGE("sctp sendv error");
-    return -1;
-  }
+  res = usrsctp_sendv(sctp->sock, buf, len, NULL, 0, &spa, sizeof(spa), SCTP_SENDV_SPA, 0);
+  if(res < 0) 
+    LOGE("sctp sendv error %d %s", errno, strerror(errno));
+  return res;
 #else
   size_t padding_len = 0;
   size_t payload_max = SCTP_MTU - sizeof(SctpPacket) - sizeof(SctpDataChunk);
@@ -176,15 +178,65 @@ int sctp_outgoing_data(Sctp *sctp, char *buf, size_t len, SctpDataPpid ppid) {
   return len;
 }
 
+void sctp_add_stream_mapping(Sctp *sctp, const char *label, uint16_t sid) {
+  if (sctp->stream_count<SCTP_MAX_STREAMS) {
+    strncpy(sctp->stream_table[sctp->stream_count].label, label, sizeof(sctp->stream_table[sctp->stream_count].label));
+    sctp->stream_table[sctp->stream_count].sid = sid;
+    sctp->stream_count++;
+  } else 
+      LOGE("Stream table full. Cannot add more streams.");    
+}
+
+void sctp_parse_data_channel_open(Sctp *sctp, uint16_t sid, char *data, size_t length) {
+  if (length < 12) 
+    return;  // Not enough data for a DATA_CHANNEL_OPEN message
+    
+  if (data[0]==DATA_CHANNEL_OPEN) {
+    uint16_t label_length = ntohs(*(uint16_t *)(data + 8));
+    uint16_t protocol_length = ntohs(*(uint16_t *)(data + 10));
+
+    // Ensure we have enough data for the label and protocol
+    if (length < 12 + label_length + protocol_length) 
+      return;
+
+    char *label = (char *)(data + 12);
+
+    // copy and null-terminate 
+    char label_str[label_length + 1];
+    memcpy(label_str, label, label_length);
+    label_str[label_length] = '\0';
+
+    // Log or process the DATA_CHANNEL_OPEN message
+    printf("DATA_CHANNEL_OPEN: Label=%s, sid=%d\n", label_str, sid);
+
+    // Add stream mapping
+    sctp_add_stream_mapping(sctp, label_str, sid);
+  }
+}
+
+void sctp_handle_sctp_packet(Sctp *sctp, char *buf, size_t len) {
+    if (len<=29)
+        return;
+  
+    if (buf[12]!=0) // if chunk_type is no zero, it's not data
+        return;
+  
+    uint16_t sid = ntohs(*(uint16_t *)(buf + 20));
+    uint32_t ppid = ntohl(*(uint32_t *)(buf + 24));
+
+    if (ppid==DATA_CHANNEL_PPID_CONTROL) 
+        sctp_parse_data_channel_open(sctp, sid, buf + 28, len - 28);
+}
+
 void sctp_incoming_data(Sctp *sctp, char *buf, size_t len) {
 
   if(!sctp)
     return;
 
 #ifdef HAVE_USRSCTP
+  sctp_handle_sctp_packet(sctp, buf, len);
   usrsctp_conninput(sctp, buf, len, 0);
 #else
-
   size_t length = 0;
   size_t pos = sizeof(SctpHeader);
   SctpChunkCommon *chunk_common;
@@ -220,6 +272,7 @@ void sctp_incoming_data(Sctp *sctp, char *buf, size_t len) {
     switch (chunk_common->type) {
 
       case SCTP_DATA:
+
         data_chunk = (SctpDataChunk*)(buf + pos);
         LOGD("SCTP_DATA. ppid = %ld", ntohl(data_chunk->ppid));
 
@@ -231,8 +284,8 @@ void sctp_incoming_data(Sctp *sctp, char *buf, size_t len) {
 #endif
         if (ntohl(data_chunk->ppid) == DATA_CHANNEL_PPID_DOMSTRING) {
 
-          if (sctp->onmessasge) {
-            sctp->onmessasge((char*)data_chunk->data, ntohs(data_chunk->length) - sizeof(SctpDataChunk), sctp->userdata);
+          if (sctp->onmessage) {
+            sctp->onmessage((char*)data_chunk->data, ntohs(data_chunk->length) - sizeof(SctpDataChunk), sctp->userdata, ntohs(data_chunk->sid));
           }
         }
 
@@ -343,30 +396,23 @@ void sctp_incoming_data(Sctp *sctp, char *buf, size_t len) {
 
 }
 
-static int sctp_handle_incoming_data(Sctp *sctp, char *data, size_t len, uint32_t ppid, uint16_t stream, int flags) {
-
+static int sctp_handle_incoming_data(Sctp *sctp, char *data, size_t len, uint32_t ppid, uint16_t sid, int flags) {
 #ifdef HAVE_USRSCTP
-  char *msg = NULL;
-
   switch(ppid) {
     case DATA_CHANNEL_PPID_CONTROL:
-
       break;
-    case DATA_CHANNEL_PPID_DOMSTRING:
 
-      msg = strndup(data, len);
-      LOGD("Got message %s (size = %ld)", msg, len);
-      if(msg && sctp->onmessasge) {
-        sctp->onmessasge(msg, len, sctp->userdata);
-        free(msg);
-      }
-      break;
+    case DATA_CHANNEL_PPID_DOMSTRING:
     case DATA_CHANNEL_PPID_BINARY:
-      break;
     case DATA_CHANNEL_PPID_DOMSTRING_PARTIAL:
-      break;
     case DATA_CHANNEL_PPID_BINARY_PARTIAL:
+
+      LOGD("Got message (size = %ld)", len);
+      if(sctp->onmessage) {
+        sctp->onmessage(data, len, sctp->userdata, sid);
+      }
       break;
+
     default:
       break;
   }
@@ -400,7 +446,8 @@ static void sctp_process_notification(Sctp *sctp, union sctp_notification *notif
           break;
 
         case SCTP_COMM_LOST:
-          sctp->connected = 1;
+        case SCTP_SHUTDOWN_COMP:
+          sctp->connected = 0;
           if(sctp->onclose) {
             sctp->onclose(sctp->userdata);
           }
@@ -411,7 +458,7 @@ static void sctp_process_notification(Sctp *sctp, union sctp_notification *notif
     default:
       break;
   }
-
+  free(notification); // we need to free the memory that usrsctp allocates
 }
 
 static int sctp_incoming_data_cb(struct socket *sock, union sctp_sockstore addr,
@@ -425,8 +472,7 @@ static int sctp_incoming_data_cb(struct socket *sock, union sctp_sockstore addr,
     ntohl(recv_info.rcv_ppid));
   if(flags & MSG_NOTIFICATION) {
     sctp_process_notification(sctp, (union sctp_notification *)data, len);
-  }
-  else {
+  } else {
     sctp_handle_incoming_data(sctp, data, len, ntohl(recv_info.rcv_ppid), recv_info.rcv_sid, flags);
   }
   return 0;
@@ -567,9 +613,9 @@ void sctp_destroy(Sctp *sctp) {
 #endif
 }
 
-void sctp_onmessage(Sctp *sctp, void (*onmessasge)(char *msg, size_t len, void *userdata)) {
+void sctp_onmessage(Sctp *sctp, void (*onmessage)(char *msg, size_t len, void *userdata, uint16_t sid)) {
 
-  sctp->onmessasge = onmessasge;
+  sctp->onmessage = onmessage;
 }
 
 void sctp_onopen(Sctp *sctp, void (*onopen)(void *userdata)) {
diff --git a/src/sctp.h b/src/sctp.h
index 70f29cb..ddcabca 100644
--- a/src/sctp.h
+++ b/src/sctp.h
@@ -105,7 +105,7 @@ typedef struct SctpDataChunk {
   uint8_t iube;
   uint16_t length;
   uint32_t tsn;
-  uint16_t si;
+  uint16_t sid;
   uint16_t sqn;
   uint32_t ppid;
   uint8_t data[0];
@@ -136,7 +136,12 @@ typedef enum SctpDataPpid {
 
 } SctpDataPpid;
 
-typedef struct Sctp Sctp;
+#define SCTP_MAX_STREAMS           5
+
+typedef struct {
+    char label[32];   // Stream label
+    uint16_t sid;     // Stream ID
+} SctpStreamEntry;
 
 typedef struct Sctp {
 
@@ -149,8 +154,11 @@ typedef struct Sctp {
   uint32_t tsn;
   DtlsSrtp *dtls_srtp;
   Buffer **data_rb;
+  int stream_count;
+  SctpStreamEntry stream_table[SCTP_MAX_STREAMS];
+
   /* datachannel */
-  void (*onmessasge)(char *msg, size_t len, void *userdata);
+  void (*onmessage)(char *msg, size_t len, void *userdata, uint16_t sid);
   void (*onopen)(void *userdata);
   void (*onclose)(void *userdata);
 
@@ -169,9 +177,9 @@ int sctp_is_connected(Sctp *sctp);
 
 void sctp_incoming_data(Sctp *sctp, char *buf, size_t len);
 
-int sctp_outgoing_data(Sctp *sctp, char *buf, size_t len, SctpDataPpid ppid);
+int sctp_outgoing_data(Sctp *sctp, char *buf, size_t len, SctpDataPpid ppid, uint16_t sid);
 
-void sctp_onmessage(Sctp *sctp, void (*onmessasge)(char *msg, size_t len, void *userdata));
+void sctp_onmessage(Sctp *sctp, void (*onmessage)(char *msg, size_t len, void *userdata, uint16_t sid));
 
 void sctp_onopen(Sctp *sctp, void (*onopen)(void *userdata));