AEC and sound backend fixes:
- Changed default sound backend in Windows to PortAudio
- Finalizing AEC settings on Windows:
	- default tail is 256 msec
	- write AEC configuration with "dc"



git-svn-id: https://svn.pjsip.org/repos/pjproject/trunk@651 74dad513-b988-da41-8d7b-12977e46ad98
diff --git a/pjsip/src/pjsua-lib/pjsua_call.c b/pjsip/src/pjsua-lib/pjsua_call.c
index 31d7f6c..6823171 100644
--- a/pjsip/src/pjsua-lib/pjsua_call.c
+++ b/pjsip/src/pjsua-lib/pjsua_call.c
@@ -795,7 +795,7 @@
     call = &pjsua_var.calls[call_id];
 
     if (!call->inv) {
-	PJ_LOG(3,(THIS_FILE,"Call has been disconnected"));
+	PJ_LOG(3,(THIS_FILE,"Invalid call or call has been disconnected"));
 	PJSUA_UNLOCK();
 	return PJ_EINVAL;
     }