Make the usereqphone option work again.

(closes issue #13474)
Reported by: mmaguire
Patches:
      20080912_bug13474.diff uploaded by mmaguire (license 571)


git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.4@161725 65c4cc65-6c06-0410-ace0-fbb531ad65f3

channels/chan_sip.c

@@ -7069,7 +7069,7 @@ static void initreqprep(struct sip_request *req, struct sip_pvt *p, int sipmetho
 				break;
 		}
 		/* If we have only digits, add ;user=phone to the uri */
-		if (*s)
+		if (!*s)
 			urioptions = ";user=phone";
 	}