Index: apps/app_voicemail.c
===================================================================
--- apps/app_voicemail.c	(revision 249447)
+++ apps/app_voicemail.c	(working copy)
@@ -5130,6 +5130,8 @@
 {
 	char tmp[256], *tmp2 = tmp, *box, *context;
 	ast_copy_string(tmp, mailbox, sizeof(tmp));
+	if (ast_strlen_zero(folder))
+		folder = "INBOX";
 	while ((box = strsep(&tmp2, ",&"))) {
 		if ((context = strchr(box, '@')))
 			*context++ = '\0';