diff -ur asterisk-1.4.0.orig/codecs/codec_ilbc.c asterisk-1.4.0/codecs/codec_ilbc.c
--- asterisk-1.4.0.orig/codecs/codec_ilbc.c	2006-09-08 17:33:32.000000000 -0400
+++ asterisk-1.4.0/codecs/codec_ilbc.c	2007-03-01 15:35:13.000000000 -0500
@@ -203,6 +203,7 @@
 	.sample = ilbctolin_sample,
 	.desc_size = sizeof(struct ilbc_coder_pvt),
 	.buf_size = BUFFER_SAMPLES * 2,
+	.native_plc = 1,
 };
 
 static struct ast_translator lintoilbc = {
Only in asterisk-1.4.0/codecs: codec_ilbc.c~
diff -ur asterisk-1.4.0.orig/codecs/codec_speex.c asterisk-1.4.0/codecs/codec_speex.c
--- asterisk-1.4.0.orig/codecs/codec_speex.c	2006-09-08 17:33:32.000000000 -0400
+++ asterisk-1.4.0/codecs/codec_speex.c	2007-03-01 15:35:20.000000000 -0500
@@ -354,6 +354,7 @@
 	.desc_size = sizeof(struct speex_coder_pvt),
 	.buffer_samples = BUFFER_SAMPLES,
 	.buf_size = BUFFER_SAMPLES * 2,
+	.native_plc = 1,
 };
 
 static struct ast_translator lintospeex = {
Only in asterisk-1.4.0/codecs: codec_speex.c~
diff -ur asterisk-1.4.0.orig/include/asterisk/translate.h asterisk-1.4.0/include/asterisk/translate.h
--- asterisk-1.4.0.orig/include/asterisk/translate.h	2006-10-31 16:47:48.000000000 -0500
+++ asterisk-1.4.0/include/asterisk/translate.h	2007-03-01 15:34:26.000000000 -0500
@@ -104,6 +104,7 @@
 	int desc_size;			/*!< size of private descriptor in pvt->pvt, if any */
 	int plc_samples;		/*!< set to the plc block size if used, 0 otherwise */
 	int useplc;			/*!< current status of plc, changed at runtime */
+	int native_plc;			/*!< true if the translator can do native plc */
 
 	struct ast_module *module;	/* opaque reference to the parent module */
 
Only in asterisk-1.4.0/include/asterisk: translate.h~
Only in asterisk-1.4.0/include/asterisk: version.h
diff -ur asterisk-1.4.0.orig/main/translate.c asterisk-1.4.0/main/translate.c
--- asterisk-1.4.0.orig/main/translate.c	2006-11-24 12:17:07.000000000 -0500
+++ asterisk-1.4.0/main/translate.c	2007-03-01 15:38:06.000000000 -0500
@@ -174,7 +174,9 @@
 				pvt->samples += l;
 				pvt->datalen = pvt->samples * 2;	/* SLIN has 2bytes for 1sample */
 			}
-			return 0;
+			/* We don't want generic PLC. If the codec has native PLC, then do that */
+			if (!pvt->t->native_plc)
+				return 0;
 		}
 		if (pvt->samples + f->samples > pvt->t->buffer_samples) {
 			ast_log(LOG_WARNING, "Out of buffer space\n");