WIP

Author: Paulo Morgado

src/core/SIP/SIPHeader.cs

@@ -18,7 +18,6 @@
 using System.Net;
 using System.Runtime.CompilerServices;
 using System.Runtime.Serialization;
-using System.Text;
 using System.Text.RegularExpressions;
 using Microsoft.Extensions.Logging;
 using SIPSorcery.Sys;