优化sip消息，去除自动dialog创建

src/main/java/com/genersoft/iot/vmp/gb28181/conf/DefaultProperties.java

@@ -0,0 +1,46 @@
+package com.genersoft.iot.vmp.gb28181.conf;
+
+import java.util.Properties;
+
+/**
+ * 获取sip默认配置
+ * @author lin
+ */
+public class DefaultProperties {
+
+    public static Properties getProperties(String ip, boolean isDebug) {
+        Properties properties = new Properties();
+        properties.setProperty("javax.sip.STACK_NAME", "GB28181_SIP");
+        properties.setProperty("javax.sip.IP_ADDRESS", ip);
+        properties.setProperty("javax.sip.AUTOMATIC_DIALOG_SUPPORT", "off");
+        /**
+         * 完整配置参考 gov.nist.javax.sip.SipStackImpl，需要下载源码
+         * gov/nist/javax/sip/SipStackImpl.class
+         * sip消息的解析在 gov.nist.javax.sip.stack.UDPMessageChannel的processIncomingDataPacket方法
+         */
+
+//		 * gov/nist/javax/sip/SipStackImpl.class
+        if (isDebug) {
+            properties.setProperty("gov.nist.javax.sip.LOG_MESSAGE_CONTENT", "false");
+        }
+        // 接收所有notify请求，即使没有订阅
+        properties.setProperty("gov.nist.javax.sip.DELIVER_UNSOLICITED_NOTIFY", "true");
+        properties.setProperty("gov.nist.javax.sip.AUTOMATIC_DIALOG_ERROR_HANDLING", "false");
+        properties.setProperty("gov.nist.javax.sip.CANCEL_CLIENT_TRANSACTION_CHECKED", "false");
+        // 为_NULL _对话框传递_终止的_事件
+        properties.setProperty("gov.nist.javax.sip.DELIVER_TERMINATED_EVENT_FOR_NULL_DIALOG", "true");
+        // 会话清理策略
+        properties.setProperty("gov.nist.javax.sip.RELEASE_REFERENCES_STRATEGY", "Normal");
+        // 处理由该服务器处理的基于底层TCP的保持生存超时
+        properties.setProperty("gov.nist.javax.sip.RELIABLE_CONNECTION_KEEP_ALIVE_TIMEOUT", "60");
+        // 获取实际内容长度，不使用header中的长度信息
+        properties.setProperty("gov.nist.javax.sip.COMPUTE_CONTENT_LENGTH_FROM_MESSAGE_BODY", "true");
+
+        /**
+         * sip_server_log.log 和 sip_debug_log.log ERROR, INFO, WARNING, OFF, DEBUG, TRACE
+         */
+        properties.setProperty("gov.nist.javax.sip.TRACE_LEVEL", "ERROR");
+
+        return properties;
+    }
+}