--- asterisk-11.7.0.o/formats/format_g729.c	2014-01-27 21:01:24.201722187 +0200
+++ asterisk-11.7.0/formats/format_g729.c	2014-01-27 22:30:19.182767226 +0200
@@ -37,6 +37,7 @@
 #include "asterisk/mod_format.h"
 #include "asterisk/module.h"
 #include "asterisk/endian.h"
+#include "asterisk/channel.h"
 
 /* Some Ideas for this code came from makeg729e.c by Jeffrey Chilton */
 
@@ -50,6 +51,9 @@
 struct ast_g729_pvt
 {
 	int detected_vad; /* simple flag indicating whether or not we detected and reported on VAD on this stream yet or not */
+	long expectpos; /* Where we *expect* the next ftell to be */
+	long cleanwrites; /* Number of writes that was clean */
+	long cleanstart ; /* byte offset that was clean */
 };
 
 static struct ast_frame *g729_read(struct ast_filestream *s, int *whennext)
@@ -74,6 +78,22 @@
 {
 	struct ast_g729_pvt* pvt = fs->_private;
 	int res, writelen = f->datalen;
+	long position = ftell(fs->f);
+
+	if (position == pvt->expectpos) {
+		pvt->cleanwrites++;
+	}
+	ast_log(LOG_WARNING, "filestream(filename=%s,owner=%s,orig_chan_name=%s,pos=%ld), frame(datalen=%d,samples=%d,ts=%ld,len=%ld,seqno=%d),expectpos=%ld,cleanwrites=%ld,cleanstart=%ld\n",
+			fs->filename, fs->owner ? ast_channel_name(fs->owner) : "(none)",
+			fs->orig_chan_name, position,
+			f->datalen, f->samples, f->ts, f->len, f->seqno,
+			pvt->expectpos, pvt->cleanwrites, pvt->cleanstart);
+	if (position != pvt->expectpos) {
+		pvt->cleanwrites = 0;
+		pvt->cleanstart = position;
+	}
+	pvt->expectpos = position + f->samples * G729A_FRAME_SIZE / (G729A_SAMPLES >> 1);
+
 	if (f->frametype != AST_FRAME_VOICE) {
 		ast_log(LOG_WARNING, "Asked to write non-voice frame!\n");
 		return -1;
@@ -122,6 +142,12 @@
 	}
 	/* protect against seeking beyond begining. */
 	offset = (offset < min)?min:offset;
+	ast_log(LOG_WARNING, "g729_seek(%s, %lu, %s), offset=%lu\n",
+			fs->filename, sample_offset, whence == SEEK_SET ? "SEEK_SET" :
+				whence == SEEK_CUR ? "SEEK_CUR" :
+				whence == SEEK_FORCECUR ? "SEEK_FORCECUR" :
+				whence == SEEK_END ? "SEEK_END" : "SEEK_???",
+				offset);
 	if (fseeko(fs->f, offset, SEEK_SET) < 0)
 		return -1;
 	return 0;