using (Entities myBase = new Entities())
using (DbConnection connection = (myBase.Connection as EntityConnection).StoreConnection)
using (DbCommand command = connection.CreateCommand())
{
    command.CommandText = "ds_GetInfo";
    command.CommandType = CommandType.StoredProcedure;

    DbParameter parameter = command.CreateParameter();
    parameter.ParameterName = "OUT";
    parameter.DbType = DbType.Int32;
    parameter.Direction = ParameterDirection.Output;
    command.Parameters.Add(parameter);

    connection.Open();
    command.ExecuteNonQuery();

    Console.WriteLine(parameter.Value);
}

<Function Name="ds_GetInfo" Aggregate="false" BuiltIn="false" NiladicFunction="false" IsComposable="false" ParameterTypeSemantics="AllowImplicitConversion" Schema="dbo">
          <Parameter Name="Out" Type="int" Mode="InOut" />
</Function>

using (var myBase = new Entities())
{
     myBase.ds_GetInfo ...
}