Index: funcs/func_strings.c
===================================================================
--- funcs/func_strings.c	(revision 220829)
+++ funcs/func_strings.c	(working copy)
@@ -384,6 +384,12 @@
 static int quote(struct ast_channel *chan, char *cmd, char *data, char *buf, size_t len)
 {
 	char *bufptr = buf, *dataptr = data;
+
+	if (len < 3){ /* at least two for quotes and one for binary zero */
+		ast_log(LOG_ERROR, "Not enough buffer");
+		return -1;
+	}
+
 	if (ast_strlen_zero(data)) {
 		ast_log(LOG_WARNING, "No argument specified!\n");
 		ast_copy_string(buf, "\"\"", len);
@@ -391,7 +397,7 @@
 	}
 
 	*bufptr++ = '"';
-	for (; bufptr < buf + len - 1; dataptr++) {
+	for (; bufptr < buf + len - 3; dataptr++) {
 		if (*dataptr == '\\') {
 			*bufptr++ = '\\';
 			*bufptr++ = '\\';
@@ -416,7 +422,44 @@
 	.read = quote,
 };
 
+static int csv_quote(struct ast_channel *chan, const char *cmd, char *data, char *buf, size_t len)
+{
+	char *bufptr = buf, *dataptr = data;
 
+	if (len < 3){ /* at least two for quotes and one for binary zero */
+		ast_log(LOG_ERROR, "Not enough buffer");
+		return -1;
+	}
+
+	if (ast_strlen_zero(data)) {
+		ast_log(LOG_WARNING, "No argument specified!\n");
+		ast_copy_string(buf,"\"\"",len);
+		return 0;
+	}
+
+	*bufptr++ = '"';
+	for (; bufptr < buf + len - 3; dataptr++){
+		if (*dataptr == '"') {
+			*bufptr++ = '"';
+			*bufptr++ = '"';
+		} else if (*dataptr == '\0') {
+			break;
+		} else {
+			*bufptr++ = *dataptr;
+		}
+	}
+	*bufptr++ = '"';
+	*bufptr='\0';
+	return 0;
+}
+
+static struct ast_custom_function csv_quote_function = {
+	.name = "CSV_QUOTE",
+	.synopsis = "Quotes a given string for use in a CSV file, escaping embedded quotes as necessary",
+	.syntax = "CSV_QUOTE(<string>)",
+	.read = csv_quote,
+};
+
 static int len(struct ast_channel *chan, char *cmd, char *data, char *buf,
 	       size_t len)
 {
@@ -610,6 +653,7 @@
 	res |= ast_custom_function_unregister(&regex_function);
 	res |= ast_custom_function_unregister(&array_function);
 	res |= ast_custom_function_unregister(&quote_function);
+	res |= ast_custom_function_unregister(&csv_quote_function);
 	res |= ast_custom_function_unregister(&len_function);
 	res |= ast_custom_function_unregister(&strftime_function);
 	res |= ast_custom_function_unregister(&strptime_function);
@@ -629,6 +673,7 @@
 	res |= ast_custom_function_register(&regex_function);
 	res |= ast_custom_function_register(&array_function);
 	res |= ast_custom_function_register(&quote_function);
+	res |= ast_custom_function_register(&csv_quote_function);
 	res |= ast_custom_function_register(&len_function);
 	res |= ast_custom_function_register(&strftime_function);
 	res |= ast_custom_function_register(&strptime_function);
Index: configs/cdr_custom.conf.sample
===================================================================
--- configs/cdr_custom.conf.sample	(revision 220829)
+++ configs/cdr_custom.conf.sample	(working copy)
@@ -6,5 +6,5 @@
 ; 
 ;
 ;[mappings]
-;Master.csv => "${CDR(clid)}","${CDR(src)}","${CDR(dst)}","${CDR(dcontext)}","${CDR(channel)}","${CDR(dstchannel)}","${CDR(lastapp)}","${CDR(lastdata)}","${CDR(start)}","${CDR(answer)}","${CDR(end)}","${CDR(duration)}","${CDR(billsec)}","${CDR(disposition)}","${CDR(amaflags)}","${CDR(accountcode)}","${CDR(uniqueid)}","${CDR(userfield)}"
+;Master.csv => ${CSV_QUOTE(${CDR(clid)})},${CSV_QUOTE(${CDR(src)})},${CSV_QUOTE(${CDR(dst)})},${CSV_QUOTE(${CDR(dcontext)})},${CSV_QUOTE(${CDR(channel)})},${CSV_QUOTE(${CDR(dstchannel)})},${CSV_QUOTE(${CDR(lastapp)})},${CSV_QUOTE(${CDR(lastdata)})},${CSV_QUOTE(${CDR(start)})},${CSV_QUOTE(${CDR(answer)})},${CSV_QUOTE(${CDR(end)})},${CSV_QUOTE(${CDR(duration)})},${CSV_QUOTE(${CDR(billsec)})},${CSV_QUOTE(${CDR(disposition)})},${CSV_QUOTE(${CDR(amaflags)})},${CSV_QUOTE(${CDR(accountcode)})},${CSV_QUOTE(${CDR(uniqueid)})},${CSV_QUOTE(${CDR(userfield)})}