<PackageReference Include="System.ServiceModel.Primitives" Version="6.2.0" />

System.ServiceModel.Channels.IOutputChannel

namespace System.ServiceModel.Channels { public interface IOutputChannel : IChannel, ICommunicationObject { EndpointAddress RemoteAddress { get; } Uri Via { get; } void Send(Message message); void Send(Message message, TimeSpan timeout); IAsyncResult BeginSend(Message message, AsyncCallback callback, object state); IAsyncResult BeginSend(Message message, TimeSpan timeout, AsyncCallback callback, object state); void EndSend(IAsyncResult result); } }