diff --git a/include/frame.hh b/include/frame.hh
index 9b1a6f5..accb67b 100644
--- a/include/frame.hh
+++ b/include/frame.hh
@@ -81,6 +81,9 @@ namespace uvg_rtp {
             uint8_t *probation;
             uint8_t *payload;
 
+            uint8_t *dgram;      /* pointer to the UDP datagram (for internal use only) */
+            size_t   dgram_size; /* size of the UDP datagram */
+
             rtp_format_t format;
             int  type;
             sockaddr_in src_addr;
diff --git a/src/rtp.cc b/src/rtp.cc
index 585a502..fc07f40 100644
--- a/src/rtp.cc
+++ b/src/rtp.cc
@@ -216,6 +216,9 @@ rtp_error_t uvg_rtp::rtp::packet_handler(ssize_t size, void *packet, int flags,
         (*out)->padding_len  = padding_len;
     }
 
-    (*out)->payload = (uint8_t *)memdup(ptr, (*out)->payload_len);
+    (*out)->payload    = (uint8_t *)memdup(ptr, (*out)->payload_len);
+    (*out)->dgram      = (uint8_t *)packet;
+    (*out)->dgram_size = size;
+
     return RTP_PKT_MODIFIED;
 }