Index: include/asterisk/localtime.h
===================================================================
--- include/asterisk/localtime.h	(revision 312285)
+++ include/asterisk/localtime.h	(working copy)
@@ -35,7 +35,7 @@
 	int tm_yday;            /*!< Days in year.[0-365]	*/
 	int tm_isdst;           /*!< DST.		[-1/0/1]*/
 	long int tm_gmtoff;     /*!< Seconds east of UTC.  */
-	char *tm_zone;          /*!< Timezone abbreviation.  */
+	const char *tm_zone;    /*!< Timezone abbreviation.  */
 	/* NOTE: do NOT reorder this final item.  The order needs to remain compatible with struct tm */
 	int tm_usec;        /*!< microseconds */
 };
Index: main/stdtime/localtime.c
===================================================================
--- main/stdtime/localtime.c	(revision 312285)
+++ main/stdtime/localtime.c	(working copy)
@@ -1296,9 +1296,7 @@
 #ifndef SOLARIS /* Solaris doesn't have this element */
 	tmp->tm_gmtoff = ttisp->tt_gmtoff;
 #endif
-#ifdef TM_ZONE
-	tmp->TM_ZONE = &sp->chars[ttisp->tt_abbrind];
-#endif /* defined TM_ZONE */
+	tmp->tm_zone = &sp->chars[ttisp->tt_abbrind];
 	tmp->tm_usec = timep->tv_usec;
 	return result;
 }
@@ -1449,17 +1447,15 @@
 	AST_LIST_UNLOCK(&zonelist);
 
 	result = timesub(timep, offset, sp, tmp);
-#ifdef TM_ZONE
 	/*
 	** Could get fancy here and deliver something such as
 	** "UTC+xxxx" or "UTC-xxxx" if offset is non-zero,
 	** but this is no time for a treasure hunt.
 	*/
 	if (offset != 0)
-		tmp->TM_ZONE = "    ";
+		tmp->tm_zone = "    ";
 	else
-		tmp->TM_ZONE = sp->chars;
-#endif /* defined TM_ZONE */
+		tmp->tm_zone = sp->chars;
 	return result;
 }
 
Index: res/res_phoneprov.c
===================================================================
--- res/res_phoneprov.c	(revision 312285)
+++ res/res_phoneprov.c	(working copy)
@@ -395,6 +395,10 @@
 	snprintf(buffer, sizeof(buffer), "%d", tm_info.tm_hour);
 	if ((var = ast_var_assign("DST_END_HOUR", buffer)))
 		AST_LIST_INSERT_TAIL(headp, var, entries);
+
+	if ((var = ast_var_assign("TIMEZONE", S_OR(zone, tm_info.tm_zone)))) {
+		AST_LIST_INSERT_TAIL(headp, var, entries);
+	}
 }
 
 /*! \brief Callback that is executed everytime an http request is received by this module */