diff --git a/CoreAgent.ProtocolClient/BuildProtocolParser/SIPProtocolParser.cs b/CoreAgent.ProtocolClient/BuildProtocolParser/SIPProtocolParser.cs
index 8b9e805..62ebf36 100644
--- a/CoreAgent.ProtocolClient/BuildProtocolParser/SIPProtocolParser.cs
+++ b/CoreAgent.ProtocolClient/BuildProtocolParser/SIPProtocolParser.cs
@@ -75,7 +75,8 @@ namespace CoreAgent.ProtocolClient.BuildProtocolParser
                 // 设置PLMN - 修复逻辑错误
                 if (!string.IsNullOrEmpty(mccValue) && !string.IsNullOrEmpty(mncValue))
                 {
-                    log.SIP.Plmn = $"{mccValue}{mncValue}";
+                    string mnc = (int.Parse(mncValue) < 100) ? int.Parse(mncValue).ToString("D2") : mncValue;
+                    log.SIP.Plmn = $"{mccValue}{mnc}";
                 }
                 
                 // 设置IMSI - 使用正确的属性