diff --git a/gb28181-sip/src/main/java/cn/skcks/docking/gb28181/constant/GB28181Constant.java b/gb28181-sip/src/main/java/cn/skcks/docking/gb28181/constant/GB28181Constant.java
index 66729be..ca8f668 100644
--- a/gb28181-sip/src/main/java/cn/skcks/docking/gb28181/constant/GB28181Constant.java
+++ b/gb28181-sip/src/main/java/cn/skcks/docking/gb28181/constant/GB28181Constant.java
@@ -1,7 +1,14 @@
 package cn.skcks.docking.gb28181.constant;
 
+import javax.sip.ListeningPoint;
+
 public class GB28181Constant {
     public static final String TIME_ZONE = "Asia/Shanghai";
     public static final String CHARSET = "GB2312";
     public static final String GEO_COORD_SYS = "WGS84";
+
+    public static class TransPort {
+        public static final String UDP = ListeningPoint.UDP;
+        public static final String TCP = ListeningPoint.TCP;
+    }
 }
diff --git a/gb28181-sip/src/test/java/cn/skcks/docking/gb28181/sip/SipTest.java b/gb28181-sip/src/test/java/cn/skcks/docking/gb28181/sip/SipTest.java
index 48e5d00..4d15bf2 100644
--- a/gb28181-sip/src/test/java/cn/skcks/docking/gb28181/sip/SipTest.java
+++ b/gb28181-sip/src/test/java/cn/skcks/docking/gb28181/sip/SipTest.java
@@ -1,5 +1,6 @@
 package cn.skcks.docking.gb28181.sip;
 
+import cn.skcks.docking.gb28181.constant.GB28181Constant;
 import cn.skcks.docking.gb28181.sip.generic.SipBuilder;
 import cn.skcks.docking.gb28181.sip.request.SipRequestBuilder;
 import cn.skcks.docking.gb28181.sip.response.SipResponseBuilder;
@@ -49,7 +50,7 @@ public class SipTest {
         CSeqHeader cSeqHeader = SipBuilder.createCSeqHeader(1, method);
         // CallId @ 后面可以是地址也可以为 域 id
         CallIdHeader callIdHeader = SipBuilder.createCallIdHeader(MessageFormat.format("{0}@{1}", "123456", localIp));
-        List<ViaHeader> viaHeaders = SipBuilder.createViaHeaders(localIp, localPort, ListeningPoint.UDP, "z9hG4bK" + "0000000001");
+        List<ViaHeader> viaHeaders = SipBuilder.createViaHeaders(localIp, localPort, GB28181Constant.TransPort.TCP, "z9hG4bK" + "0000000001");
         MaxForwardsHeader maxForwardsHeader = SipBuilder.createMaxForwardsHeader(70);
 
         // 创建请求