diff --git a/gb28181-sip/src/main/java/cn/skcks/docking/gb28181/sip/method/invite/response/InviteResponseBuilder.java b/gb28181-sip/src/main/java/cn/skcks/docking/gb28181/sip/method/invite/response/InviteResponseBuilder.java
index 90e53b0..798846b 100644
--- a/gb28181-sip/src/main/java/cn/skcks/docking/gb28181/sip/method/invite/response/InviteResponseBuilder.java
+++ b/gb28181-sip/src/main/java/cn/skcks/docking/gb28181/sip/method/invite/response/InviteResponseBuilder.java
@@ -54,4 +54,8 @@ public class InviteResponseBuilder implements InviteBuilder {
                 response,
                 SipBuilder.createContactHeader(sipResponse.getFromHeader().getAddress()));
     }
+
+    public Response createTryingInviteResponse(Request request){
+        return SipResponseBuilder.createResponse(Response.TRYING,request);
+    }
 }
diff --git a/gb28181-sip/src/test/java/cn/skcks/docking/gb28181/sip/process/RequestTest.java b/gb28181-sip/src/test/java/cn/skcks/docking/gb28181/sip/process/RequestTest.java
index efa31ac..0239a5e 100644
--- a/gb28181-sip/src/test/java/cn/skcks/docking/gb28181/sip/process/RequestTest.java
+++ b/gb28181-sip/src/test/java/cn/skcks/docking/gb28181/sip/process/RequestTest.java
@@ -94,6 +94,8 @@ public class RequestTest {
         // 下载请求
         Request downloadInviteRequest = inviteRequestBuilder.createDownloadInviteRequest(callId, 1, localId, receiveRtp, receiveRtpPort, playBackSsrc, MediaStreamMode.TCP_ACTIVE,startTime,endTime,4.0);
         log.info("\n{}", downloadInviteRequest);
+        Response tryingInviteResponse = inviteResponseBuilder.createTryingInviteResponse(downloadInviteRequest);
+        log.info("\n{}", tryingInviteResponse);
         inviteResponse = inviteResponseBuilder.createInviteResponse(downloadInviteRequest, senderRtp, senderRtpPort, SipUtil.nanoId());
         log.info("\n{}", inviteResponse);
     }