reject call attempts when gatekeeper is configured but not registered

(closes issue ASTERISK-21800)
Reported by: Dmitry Melekhov
Patches:
        ASTERISK-21800-1.patch
Tested by: Dmitry Melekhov
........

Merged revisions 390181 from http://svn.asterisk.org/svn/asterisk/branches/1.8
........

Merged revisions 390223 from http://svn.asterisk.org/svn/asterisk/branches/10


git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/11@390228 65c4cc65-6c06-0410-ace0-fbb531ad65f3

addons/chan_ooh323.c

@@ -308,6 +308,8 @@ int onCallEstablished(ooCallData *call);
 int onCallCleared(ooCallData *call);
 void onModeChanged(ooCallData *call, int t38mode);
 
+extern OOH323EndPoint gH323ep;
+
 static char gLogFile[256] = DEFAULT_LOGFILE;
 static int  gPort = 1720;
 static char gIP[2+8*4+7];	/* Max for IPv6 addr */
@@ -644,6 +646,7 @@ static struct ast_channel *ooh323_request(const char *type, struct ast_format_ca
 		ooh323_destroy(p);
 		ast_mutex_unlock(&iflock);
 		ast_log(LOG_ERROR, "Destination format is not supported\n");
+		*cause = AST_CAUSE_INVALID_NUMBER_FORMAT;
 		return NULL;
 	}
 
@@ -691,6 +694,10 @@ static struct ast_channel *ooh323_request(const char *type, struct ast_format_ca
 			ooh323_destroy(p);
 			ast_mutex_unlock(&iflock);
 			return NULL;
+		} else if (gH323ep.gkClient && gH323ep.gkClient->state != GkClientRegistered) {
+			ast_log(LOG_ERROR, "Gatekeeper client is configured but not registered\n");
+			*cause = AST_CAUSE_NORMAL_TEMPORARY_FAILURE;
+			return NULL;
 		}
 		p->g729onlyA = g729onlyA;
 		p->dtmfmode = gDTMFMode;