优化国标规范，参考国标文档中-点播外域设备媒体流SSRC处理方式，上级点播时自定义ssrc，不适用上级携带的ssrc，也避免上级兼容性差，不携带ssrc的问题，可通过配置关闭此特性

src/main/java/com/genersoft/iot/vmp/conf/UserSetting.java

@@ -53,6 +53,7 @@ public class UserSetting {
     private Boolean refuseChannelStatusChannelFormNotify = Boolean.FALSE;
 
     private Boolean deviceStatusNotify = Boolean.FALSE;
+    private Boolean useCustomSsrcForParentInvite = Boolean.TRUE;
 
     private String serverId = "000000";
 
@@ -277,4 +278,12 @@ public class UserSetting {
     public void setDeviceStatusNotify(Boolean deviceStatusNotify) {
         this.deviceStatusNotify = deviceStatusNotify;
     }
+
+    public Boolean getUseCustomSsrcForParentInvite() {
+        return useCustomSsrcForParentInvite;
+    }
+
+    public void setUseCustomSsrcForParentInvite(Boolean useCustomSsrcForParentInvite) {
+        this.useCustomSsrcForParentInvite = useCustomSsrcForParentInvite;
+    }
 }