Index: channels/chan_sip.c
===================================================================
--- channels/chan_sip.c	(revision 62249)
+++ channels/chan_sip.c	(working copy)
@@ -14158,19 +14158,24 @@
 		return 0;
 	}
 
-	if (strcasecmp(args.param, "rtpqos"))
+	if (!ast_strlen_zero(args.param) && strcasecmp(args.param, "rtpqos"))
 		return 0;
 
 	memset(buf, 0, buflen);
 	memset(&qos, 0, sizeof(qos));
 
-	if (strcasecmp(args.type, "AUDIO") == 0) {
+	if (ast_strlen_zero(args.type))
+		return -1;
+	else if (strcasecmp(args.type, "AUDIO") == 0) {
 		all = ast_rtp_get_quality(p->rtp, &qos);
 	} else if (strcasecmp(args.type, "VIDEO") == 0) {
 		all = ast_rtp_get_quality(p->vrtp, &qos);
-	}
+	} else
+		return -1;
 
-	if (strcasecmp(args.field, "local_ssrc") == 0)
+	if (ast_strlen_zero(args.field))
+		return -1;
+	else if (strcasecmp(args.field, "local_ssrc") == 0)
 		snprintf(buf, buflen, "%u", qos.local_ssrc);
 	else if (strcasecmp(args.field, "local_lostpackets") == 0)
 		snprintf(buf, buflen, "%u", qos.local_lostpackets);