diff --git a/src/main/java/com/genersoft/iot/vmp/gb28181/service/impl/PlatformServiceImpl.java b/src/main/java/com/genersoft/iot/vmp/gb28181/service/impl/PlatformServiceImpl.java
index ea5dbd10..19a5e56f 100755
--- a/src/main/java/com/genersoft/iot/vmp/gb28181/service/impl/PlatformServiceImpl.java
+++ b/src/main/java/com/genersoft/iot/vmp/gb28181/service/impl/PlatformServiceImpl.java
@@ -486,7 +486,7 @@ public class PlatformServiceImpl implements IPlatformService {
             log.info("[国标级联] 语音喊话未找到可用的zlm. platform: {}", platform.getServerGBId());
             return;
         }
-        InviteInfo inviteInfoForOld = inviteStreamService.getInviteInfoByDeviceAndChannel(InviteSessionType.PLAY, channel.getGbId());
+        InviteInfo inviteInfoForOld = inviteStreamService.getInviteInfoByDeviceAndChannel(InviteSessionType.BROADCAST, channel.getGbId());
 
         if (inviteInfoForOld != null && inviteInfoForOld.getStreamInfo() != null) {
             // 如果zlm不存在这个流，则删除数据即可
diff --git a/src/main/java/com/genersoft/iot/vmp/gb28181/transmit/cmd/impl/SIPCommanderForPlatform.java b/src/main/java/com/genersoft/iot/vmp/gb28181/transmit/cmd/impl/SIPCommanderForPlatform.java
index e0f92f33..918a29fa 100755
--- a/src/main/java/com/genersoft/iot/vmp/gb28181/transmit/cmd/impl/SIPCommanderForPlatform.java
+++ b/src/main/java/com/genersoft/iot/vmp/gb28181/transmit/cmd/impl/SIPCommanderForPlatform.java
@@ -737,6 +737,8 @@ public class SIPCommanderForPlatform implements ISIPCommanderForPlatform {
         }
 
         content.append("y=" + ssrcInfo.getSsrc() + "\r\n");//ssrc
+        // f字段:f= v/编码格式/分辨率/帧率/码率类型/码率大小a/编码格式/码率大小/采样率
+        content.append("f=v/////a/1/8/1\r\n");
         CallIdHeader callIdHeader = sipSender.getNewCallIdHeader(sipLayer.getLocalIp(platform.getDeviceIp()), platform.getTransport());
 
         Request request = headerProviderPlatformProvider.createInviteRequest(platform, channel.getGbDeviceId(),