Index: main/say.c
===================================================================
--- main/say.c	(revision 199741)
+++ main/say.c	(working copy)
@@ -345,7 +345,7 @@
 static int ast_say_number_full_pl(struct ast_channel *chan, int num, const char *ints, const char *language, const char *options, int audiofd, int ctrlfd);
 static int ast_say_number_full_pt(struct ast_channel *chan, int num, const char *ints, const char *language, const char *options, int audiofd, int ctrlfd);
 static int ast_say_number_full_se(struct ast_channel *chan, int num, const char *ints, const char *language, const char *options, int audiofd, int ctrlfd);
-static int ast_say_number_full_tw(struct ast_channel *chan, int num, const char *ints, const char *language, int audiofd, int ctrlfd);
+static int ast_say_number_full_zh(struct ast_channel *chan, int num, const char *ints, const char *language, int audiofd, int ctrlfd);
 static int ast_say_number_full_gr(struct ast_channel *chan, int num, const char *ints, const char *language, int audiofd, int ctrlfd);
 static int ast_say_number_full_ru(struct ast_channel *chan, int num, const char *ints, const char *language, const char *options, int audiofd, int ctrlfd);
 static int ast_say_number_full_ge(struct ast_channel *chan, int num, const char *ints, const char *language, const char *options, int audiofd, int ctrlfd);
@@ -377,7 +377,7 @@
 static int ast_say_date_with_format_nl(struct ast_channel *chan, time_t time, const char *ints, const char *lang, const char *format, const char *timezone);
 static int ast_say_date_with_format_pl(struct ast_channel *chan, time_t time, const char *ints, const char *lang, const char *format, const char *timezone);
 static int ast_say_date_with_format_pt(struct ast_channel *chan, time_t time, const char *ints, const char *lang, const char *format, const char *timezone);
-static int ast_say_date_with_format_tw(struct ast_channel *chan, time_t time, const char *ints, const char *lang, const char *format, const char *timezone);
+static int ast_say_date_with_format_zh(struct ast_channel *chan, time_t time, const char *ints, const char *lang, const char *format, const char *timezone);
 static int ast_say_date_with_format_gr(struct ast_channel *chan, time_t time, const char *ints, const char *lang, const char *format, const char *timezone);
 
 static int ast_say_time_en(struct ast_channel *chan, time_t t, const char *ints, const char *lang);
@@ -386,7 +386,7 @@
 static int ast_say_time_nl(struct ast_channel *chan, time_t t, const char *ints, const char *lang);
 static int ast_say_time_pt(struct ast_channel *chan, time_t t, const char *ints, const char *lang);
 static int ast_say_time_pt_BR(struct ast_channel *chan, time_t t, const char *ints, const char *lang);
-static int ast_say_time_tw(struct ast_channel *chan, time_t t, const char *ints, const char *lang);
+static int ast_say_time_zh(struct ast_channel *chan, time_t t, const char *ints, const char *lang);
 static int ast_say_time_gr(struct ast_channel *chan, time_t t, const char *ints, const char *lang);
 static int ast_say_time_ge(struct ast_channel *chan, time_t t, const char *ints, const char *lang);
 static int ast_say_time_he(struct ast_channel *chan, time_t t, const char *ints, const char *lang);
@@ -397,7 +397,7 @@
 static int ast_say_datetime_nl(struct ast_channel *chan, time_t t, const char *ints, const char *lang);
 static int ast_say_datetime_pt(struct ast_channel *chan, time_t t, const char *ints, const char *lang);
 static int ast_say_datetime_pt_BR(struct ast_channel *chan, time_t t, const char *ints, const char *lang);
-static int ast_say_datetime_tw(struct ast_channel *chan, time_t t, const char *ints, const char *lang);
+static int ast_say_datetime_zh(struct ast_channel *chan, time_t t, const char *ints, const char *lang);
 static int ast_say_datetime_gr(struct ast_channel *chan, time_t t, const char *ints, const char *lang);
 static int ast_say_datetime_ge(struct ast_channel *chan, time_t t, const char *ints, const char *lang);
 static int ast_say_datetime_he(struct ast_channel *chan, time_t t, const char *ints, const char *lang);
@@ -450,8 +450,8 @@
 	   return(ast_say_number_full_pt(chan, num, ints, language, options, audiofd, ctrlfd));
 	} else if (!strcasecmp(language, "se") ) {	/* Swedish syntax */
 	   return(ast_say_number_full_se(chan, num, ints, language, options, audiofd, ctrlfd));
-	} else if (!strcasecmp(language, "tw") || !strcasecmp(language, "zh") ) {	/* Taiwanese / Chinese syntax */
-	   return(ast_say_number_full_tw(chan, num, ints, language, audiofd, ctrlfd));
+	} else if (!strncasecmp(language, "zh", 2) ) {	/* Taiwanese / Chinese syntax */
+	   return(ast_say_number_full_zh(chan, num, ints, language, audiofd, ctrlfd));
 	} else if (!strcasecmp(language, "gr") ) {	/* Greek syntax */
 	   return(ast_say_number_full_gr(chan, num, ints, language, audiofd, ctrlfd));
 	} else if (!strcasecmp(language, "ru") ) {	/* Russian syntax */
@@ -2147,8 +2147,8 @@
 	return res;
 }
 
-/*! \brief  ast_say_number_full_tw: Taiwanese / Chinese syntax */
-static int ast_say_number_full_tw(struct ast_channel *chan, int num, const char *ints, const char *language, int audiofd, int ctrlfd)
+/*! \brief  ast_say_number_full_zh: Taiwanese / Chinese syntax */
+static int ast_say_number_full_zh(struct ast_channel *chan, int num, const char *ints, const char *language, int audiofd, int ctrlfd)
 {
 	int res = 0;
 	int playh = 0;
@@ -2223,7 +2223,7 @@
 					last_length = strlen(buf);
 					num -= ((num / 1000) * 1000);
 				} else if (num < 100000000) { /* 100,000,000 */
-						res = ast_say_number_full_tw(chan, num / 10000, ints, language, audiofd, ctrlfd);
+						res = ast_say_number_full_zh(chan, num / 10000, ints, language, audiofd, ctrlfd);
 						if (res)
 							return res;
 						snprintf(buf, 10, "%d", num);
@@ -2233,7 +2233,7 @@
 						snprintf(fn, sizeof(fn), "digits/wan");
 				} else {
 					if (num < 1000000000) { /* 1000,000,000 */
-						res = ast_say_number_full_tw(chan, num / 100000000, ints, language, audiofd, ctrlfd);
+						res = ast_say_number_full_zh(chan, num / 100000000, ints, language, audiofd, ctrlfd);
 						if (res)
 							return res;
 						snprintf(buf, 10, "%d", num);
@@ -3186,8 +3186,8 @@
 		return (ast_say_date_with_format_pl(chan, time, ints, lang, format, timezone));
 	} else if (!strcasecmp(lang, "pt") || !strcasecmp(lang, "pt_BR")) {	/* Portuguese syntax */
 		return(ast_say_date_with_format_pt(chan, time, ints, lang, format, timezone));
-	} else if (!strcasecmp(lang, "tw") || !strcasecmp(lang, "zh") ) {	/* Taiwanese / Chinese syntax */
-		return(ast_say_date_with_format_tw(chan, time, ints, lang, format, timezone));
+	} else if (!strncasecmp(lang, "zh", 2) ) {	/* Taiwanese / Chinese syntax */
+		return(ast_say_date_with_format_zh(chan, time, ints, lang, format, timezone));
 	} else if (!strcasecmp(lang, "gr") ) {	/* Greek syntax */
 		return(ast_say_date_with_format_gr(chan, time, ints, lang, format, timezone));
 	}
@@ -5365,7 +5365,7 @@
 }
 
 /* Taiwanese / Chinese syntax */
-int ast_say_date_with_format_tw(struct ast_channel *chan, time_t time, const char *ints, const char *lang, const char *format, const char *timezone)
+int ast_say_date_with_format_zh(struct ast_channel *chan, time_t time, const char *ints, const char *lang, const char *format, const char *timezone)
 {
 	struct tm tm;
 	int res=0, offset, sndoffset;
@@ -5558,7 +5558,7 @@
 						/* Yesterday */
 						res = wait_file(chan,ints, "digits/yesterday",lang);
 					} else {
-						res = ast_say_date_with_format_tw(chan, time, ints, lang, "YBdA", timezone);
+						res = ast_say_date_with_format_zh(chan, time, ints, lang, "YBdA", timezone);
 					}
 				}
 				break;
@@ -5585,14 +5585,14 @@
 						res = wait_file(chan,ints, "digits/yesterday",lang);
 					} else if (beg_today - 86400 * 6 < time) {
 						/* Within the last week */
-						res = ast_say_date_with_format_tw(chan, time, ints, lang, "A", timezone);
+						res = ast_say_date_with_format_zh(chan, time, ints, lang, "A", timezone);
 					} else {
-						res = ast_say_date_with_format_tw(chan, time, ints, lang, "YBdA", timezone);
+						res = ast_say_date_with_format_zh(chan, time, ints, lang, "YBdA", timezone);
 					}
 				}
 				break;
 			case 'R':
-				res = ast_say_date_with_format_tw(chan, time, ints, lang, "kM", timezone);
+				res = ast_say_date_with_format_zh(chan, time, ints, lang, "kM", timezone);
 				break;
 			case 'S':
 				/* Seconds */
@@ -5615,7 +5615,7 @@
 				}
 				break;
 			case 'T':
-				res = ast_say_date_with_format_tw(chan, time, ints, lang, "HMS", timezone);
+				res = ast_say_date_with_format_zh(chan, time, ints, lang, "HMS", timezone);
 				break;
 			case ' ':
 			case '	':
@@ -5647,8 +5647,8 @@
 		return(ast_say_time_pt(chan, t, ints, lang));
 	} else if (!strcasecmp(lang, "pt_BR") ) {	/* Brazilian Portuguese syntax */
 		return(ast_say_time_pt_BR(chan, t, ints, lang));		
-	} else if (!strcasecmp(lang, "tw") || !strcasecmp(lang, "zh") ) {	/* Taiwanese / Chinese syntax */
-		return(ast_say_time_tw(chan, t, ints, lang));
+	} else if (!strncasecmp(lang, "zh", 2) ) {	/* Taiwanese / Chinese syntax */
+		return(ast_say_time_zh(chan, t, ints, lang));
 	} else if (!strcasecmp(lang, "gr") ) {  			/* Greek syntax */
 		return(ast_say_time_gr(chan, t, ints, lang));
 	} else if (!strcasecmp(lang, "ge") ) {  /* Georgian syntax */
@@ -5823,7 +5823,7 @@
 }
 
 /* Taiwanese / Chinese  syntax */
-int ast_say_time_tw(struct ast_channel *chan, time_t t, const char *ints, const char *lang)
+int ast_say_time_zh(struct ast_channel *chan, time_t t, const char *ints, const char *lang)
 {
 	struct tm tm;
 	int res = 0;
@@ -5911,8 +5911,8 @@
 		return(ast_say_datetime_pt(chan, t, ints, lang));
 	} else if (!strcasecmp(lang, "pt_BR") ) {	/* Brazilian Portuguese syntax */
 		return(ast_say_datetime_pt_BR(chan, t, ints, lang));		
-	} else if (!strcasecmp(lang, "tw") || !strcasecmp(lang, "zh") ) {	/* Taiwanese / Chinese syntax */
-		return(ast_say_datetime_tw(chan, t, ints, lang));
+	} else if (!strncasecmp(lang, "zh", 2) ) {	/* Taiwanese / Chinese syntax */
+		return(ast_say_datetime_zh(chan, t, ints, lang));
 	} else if (!strcasecmp(lang, "gr") ) {  			/* Greek syntax */
 		return(ast_say_datetime_gr(chan, t, ints, lang));
 	} else if (!strcasecmp(lang, "ge") ) {  /* Georgian syntax */
@@ -6143,7 +6143,7 @@
 }
 
 /* Taiwanese / Chinese syntax */
-int ast_say_datetime_tw(struct ast_channel *chan, time_t t, const char *ints, const char *lang)
+int ast_say_datetime_zh(struct ast_channel *chan, time_t t, const char *ints, const char *lang)
 {
 	struct tm tm;
 	char fn[256];
Index: UPGRADE.txt
===================================================================
--- UPGRADE.txt	(revision 199741)
+++ UPGRADE.txt	(working copy)
@@ -106,6 +106,14 @@
   if your dialplan relies on the ability to 'run off the end' of an extension
   and wait for a new extension without using WaitExten() to accomplish that,
   you will need set autofallthrough to 'no' in your extensions.conf file.
+
+Language Support:
+
+* Support for Taiwanese was incorrectly supported with the "tw" language code.
+  In reality, the "tw" language code is reserved for the Twi language, native
+  to Ghana.  If you were previously using the "tw" language code, you should
+  switch to using either "zh" (for Mandarin Chinese) or "zh_TW" for Taiwan
+  specific localizations.
  
 Command Line Interface: