Index: channels/chan_sip.c
===================================================================
--- channels/chan_sip.c	(revision 36146)
+++ channels/chan_sip.c	(working copy)
@@ -14551,14 +14551,10 @@
 					res = AST_DEVICE_BUSY;
 				else if (p->call_limit && p->inUse)
 					res = AST_DEVICE_INUSE;
-				else
+				else if (p->call_limit)
 					res = AST_DEVICE_NOT_INUSE;
-				if (p->inRinging) {
-					if (p->inRinging == p->inUse)
-						res = AST_DEVICE_RINGING;
-					else
-						res = AST_DEVICE_RINGINUSE;
-				}
+				else
+					res = AST_DEVICE_UNKNOWN;
 			}
 		} else {
 			/* there is no address, it's unavailable */