diff --git a/sip/SipServer.cpp b/sip/SipServer.cpp
index 663d850..7442d91 100644
--- a/sip/SipServer.cpp
+++ b/sip/SipServer.cpp
@@ -555,7 +555,7 @@ void SipServer::response_message(eXosip_event_t *evtp) {
         return;
     }
 
-    // std::cout << CmdType << std::endl;
+    LOG_INFO("CmdType={},DeviceID={}", CmdType, DeviceID);
 
     if(!strcmp(CmdType, "Catalog")) {
         this->response_message_answer(evtp,200);
@@ -580,13 +580,15 @@ void SipServer::response_message(eXosip_event_t *evtp) {
         m_device_map[info.id] = info;
 
     } else if(!strcmp(CmdType, "Keepalive")){
-        this->response_message_answer(evtp,200);
-        LOG_INFO("CmdType={},DeviceID={}", CmdType, DeviceID);
         std::lock_guard<std::mutex> l_c(m_client_map_mtx);
         auto it = mClientMap.find(DeviceID);
         if (it != mClientMap.end()) {
+            response_message_answer(evtp,200);
             it->second->updateHeartBeat(Utools::get_cur_time_ms());
             return ;
+        } else {
+            // 未注册设备发保活信息，超过设备的最大超时次数后，设备将进行初始注册
+            response_message_answer(evtp,408);
         }
     }else{
         this->response_message_answer(evtp,200);