diff --git a/gb28181-sip/src/main/java/cn/skcks/docking/gb28181/sip/method/register/request/RegisterRequestBuilder.java b/gb28181-sip/src/main/java/cn/skcks/docking/gb28181/sip/method/register/request/RegisterRequestBuilder.java
index d7dc8f3..ee4ab63 100644
--- a/gb28181-sip/src/main/java/cn/skcks/docking/gb28181/sip/method/register/request/RegisterRequestBuilder.java
+++ b/gb28181-sip/src/main/java/cn/skcks/docking/gb28181/sip/method/register/request/RegisterRequestBuilder.java
@@ -38,7 +38,7 @@ public class RegisterRequestBuilder extends RequestBuilder implements RegisterBu
     @SneakyThrows
     public Request createAuthorizationRequest(String callId, int expires, String id, String passwd, long cSeq, WWWAuthenticateHeader wwwAuthenticateHeader) {
         SIPRequest request = (SIPRequest) createNoAuthorizationRequest(callId, expires);
-        request.getCSeq().setSeqNumber(cSeq + 1);
+        request.getCSeq().setSeqNumber(cSeq);
         AuthorizationHeader authorization = DigestAuthenticationHelper.createAuthorization(METHOD, getTargetIp(), getTargetPort(), getTargetId(), id, passwd, (int) cSeq, wwwAuthenticateHeader);
         return SipBuilder.addHeaders(request, authorization);
     }
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 3f3c130..1b42f11 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
@@ -95,7 +95,7 @@ public class RequestTest {
         log.info("\n{}", authorzatioinResponse);
         SIPResponse sipResponse = (SIPResponse) authorzatioinResponse;
         WWWAuthenticateHeader wwwAuthenticateHeader = (WWWAuthenticateHeader) sipResponse.getHeader(WWWAuthenticateHeader.NAME);
-        long cSeq = sipResponse.getCSeq().getSeqNumber();
+        long cSeq = sipResponse.getCSeq().getSeqNumber() + 1;
         // 重新发起带有认证信息的请求
         Request authorizationRequest = registerRequestBuilder.createAuthorizationRequest(callId, 3600, localId, "123456", cSeq, wwwAuthenticateHeader);
         log.info("\n{}", authorizationRequest);