Index: tika-core/src/main/java/org/apache/tika/sax/PhoneExtractingContentHandler.java
===================================================================
--- tika-core/src/main/java/org/apache/tika/sax/PhoneExtractingContentHandler.java	(revision 1630229)
+++ tika-core/src/main/java/org/apache/tika/sax/PhoneExtractingContentHandler.java	(working copy)
@@ -104,8 +104,10 @@
     public void endDocument() throws SAXException {
         super.endDocument();
         List<String> numbers = CleanPhoneText.extractPhoneNumbers(stringBuilder.toString());
+        StringBuilder sb = new StringBuilder();
         for (String number : numbers) {
-            metadata.add(PHONE_NUMBERS, number);
+          sb.append(number + ",");
         }
+        metadata.add(PHONE_NUMBERS, sb.toString());
     }
 }