diff -Naur asterisk-11.7.0/res/res_rtp_asterisk.c asterisk-11.7.0_edited/res/res_rtp_asterisk.c
--- asterisk-11.7.0/res/res_rtp_asterisk.c	2013-10-23 19:37:15.000000000 +0200
+++ asterisk-11.7.0_edited/res/res_rtp_asterisk.c	2014-02-25 13:30:17.379414390 +0100
@@ -2172,7 +2172,7 @@
 
 	/* We simply set this bit so that the next packet sent will have the marker bit turned on */
 	ast_set_flag(rtp, FLAG_NEED_MARKER_BIT);
-	ast_debug(3, "Setting the marker bit due to a source update\n");
+	ast_debug(3, "RTP instance, '%p', Setting the marker bit due to a source update\n", instance);
 
 	return;
 }
@@ -2499,6 +2499,8 @@
 	struct ast_sockaddr remote_address = { {0,} };
 	int rate = rtp_get_rate(&frame->subclass.format) / 1000;
 
+	ast_debug(3, "RTP preraw instance '%p', seqno is %d, lastts is %d\n", instance, rtp->seqno, rtp->lastts);
+
 	if (frame->subclass.format.id == AST_FORMAT_G722) {
 		frame->samples /= 2;
 	}
@@ -2510,15 +2512,18 @@
 	if (frame->frametype == AST_FRAME_VOICE) {
 		pred = rtp->lastts + frame->samples;
 
+		ast_debug(3, "RTP preraw2 instance '%p', seqno is %d, lastts is %d\n, pred is %d", instance, rtp->seqno, rtp->lastts, pred);
 		/* Re-calculate last TS */
 		rtp->lastts = rtp->lastts + ms * rate;
+		ast_debug(3, "RTP preraw3 instance '%p', seqno is %d, lastts is %d\n, pred is %d", instance, rtp->seqno, rtp->lastts, pred);
 		if (ast_tvzero(frame->delivery)) {
 			/* If this isn't an absolute delivery time, Check if it is close to our prediction,
 			   and if so, go with our prediction */
 			if (abs(rtp->lastts - pred) < MAX_TIMESTAMP_SKEW) {
 				rtp->lastts = pred;
+				ast_debug(3, "RTP preraw4 instance '%p', seqno is %d, lastts is %d\n, pred is %d", instance, rtp->seqno, rtp->lastts, pred);
 			} else {
-				ast_debug(3, "Difference is %d, ms is %d\n", abs(rtp->lastts - pred), ms);
+				ast_debug(3, "RTP voice instance '%p', Difference is %d, ms is %d\n", instance, abs(rtp->lastts - pred), ms);
 				mark = 1;
 			}
 		}
@@ -2533,7 +2538,7 @@
 				rtp->lastts = pred;
 				rtp->lastovidtimestamp += frame->samples;
 			} else {
-				ast_debug(3, "Difference is %d, ms is %d (%d), pred/ts/samples %d/%d/%d\n", abs(rtp->lastts - pred), ms, ms * 90, rtp->lastts, pred, frame->samples);
+				ast_debug(3, "RTP video instance '%p', Difference is %d, ms is %d (%d), pred/ts/samples %d/%d/%d\n", instance, abs(rtp->lastts - pred), ms, ms * 90, rtp->lastts, pred, frame->samples);
 				rtp->lastovidtimestamp = rtp->lastts;
 			}
 		}
@@ -2547,7 +2552,7 @@
 				rtp->lastts = pred;
 				rtp->lastotexttimestamp += frame->samples;
 			} else {
-				ast_debug(3, "Difference is %d, ms is %d, pred/ts/samples %d/%d/%d\n", abs(rtp->lastts - pred), ms, rtp->lastts, pred, frame->samples);
+				ast_debug(3, "RTP other instance '%p', Difference is %d, ms is %d, pred/ts/samples %d/%d/%d\n", instance, abs(rtp->lastts - pred), ms, rtp->lastts, pred, frame->samples);
 				rtp->lastotexttimestamp = rtp->lastts;
 			}
 		}
@@ -2559,6 +2564,8 @@
 		ast_clear_flag(rtp, FLAG_NEED_MARKER_BIT);
 	}
 
+	ast_debug(3, "RTP preraw5 instance '%p', seqno is %d, lastts is %d\n", instance, rtp->seqno, rtp->lastts);
+
 	/* If the timestamp for non-digt packets has moved beyond the timestamp for digits, update the digit timestamp */
 	if (rtp->lastts > rtp->lastdigitts) {
 		rtp->lastdigitts = rtp->lastts;
@@ -2568,6 +2575,8 @@
 		rtp->lastts = frame->ts * rate;
 	}
 
+	ast_debug(3, "RTP preraw6 instance '%p', seqno is %d, lastts is %d\n", instance, rtp->seqno, rtp->lastts);
+
 	ast_rtp_instance_get_remote_address(instance, &remote_address);
 
 	/* If we know the remote address construct a packet and send it out */
@@ -2612,7 +2621,8 @@
 #endif
 
 		if (rtp_debug_test_addr(&remote_address)) {
-			ast_verbose("Sent RTP packet to      %s%s (type %-2.2d, seq %-6.6u, ts %-6.6u, len %-6.6u)\n",
+			ast_verbose("RTP instance '%p', Sent RTP packet to      %s%s (type %-2.2d, seq %-6.6u, ts %-6.6u, len %-6.6u)\n",
+				    instance,
 				    ast_sockaddr_stringify(&remote_address),
 				    ice ? " (via ICE)" : "",
 				    codec, rtp->seqno, rtp->lastts, res - hdrlen);