diff --git a/src/csn1.c b/src/csn1.c
index 0a3c88c..2be0392 100644
--- a/src/csn1.c
+++ b/src/csn1.c
@@ -2694,7 +2694,13 @@
 
       case CSN_CALLBACK:
       {
-        return ProcessError(writeIndex,"csnStreamEncoder Callback not implemented", -1, pDescr);
+        guint16  no_of_bits;
+        DissectorCallbackFcn_t callback = (DissectorCallbackFcn_t)pDescr->aux_fn;
+        LOGPC(DCSN1, LOGL_DEBUG, "CSN_CALLBACK(%s) | ", pDescr->sz);
+        no_of_bits = callback(vector, writeIndex, pvDATA(data, pDescr->i), pvDATA(data, pDescr->offset));
+        remaining_bits_len -= no_of_bits;
+        bit_offset += no_of_bits;
+        pDescr++;
         break;
       }