PString OpalManager::ApplyRouteTable(const PString & a_party, const PString & b_party, ...
...
  if (at != P_MAX_INDEX) {
    destination.Replace("<du>", user, true);
    ReplaceNDU(destination, b_party.Mid(at));
  }
  else if (PIPSocket::IsLocalHost(user.Left(user.Find(':')))) { //user.Left(user.Find(':'))="0074951234567" 
    destination.Replace("<du>", "", true);
    ReplaceNDU(destination, user);
  }
  else {
    destination.Replace("<du>", user, true);
    ReplaceNDU(destination, "");
  }
...
===
PBoolean PIPSocket::IsLocalHost(const PString & hostname)
...
  Address addr(0);
  if (!GetHostAddress(hostname, addr)) //hostname="0074951234567"
    return false;
...
===
PBoolean PIPSocket::GetHostAddress(const PString & hostname, Address & addr)
...
  // otherwise lookup the name as a host name
  return pHostByName().GetHostAddress(hostname, addr); //hostname="0074951234567"
}
===
PBoolean PHostByName::GetHostAddress(const PString & name, PIPSocket::Address & address)
{
  PIPCacheData * host = GetHost(name);/name="0074951234567"
...
===
PIPCacheData * PHostByName::GetHost(const PString & name)
{
...
    struct addrinfo *res = NULL;
    struct addrinfo hints = { AI_CANONNAME, defaultIpAddressFamily };
    localErrNo = getaddrinfo((const char *)name, NULL , &hints, &res); //name="0074951234567"
...

PString OpalManager::ApplyRouteTable(const PString & a_party, const PString & b_party, ...
...
  if (at != P_MAX_INDEX) {
    destination.Replace("<du>", user, true);
    ReplaceNDU(destination, b_party.Mid(at));
  }
  //else if (PIPSocket::IsLocalHost(user.Left(user.Find(':')))) { //user.Left(user.Find(':'))="0074951234567" 
  //  destination.Replace("<du>", "", true);
  //  ReplaceNDU(destination, user);
  //}
  else {
    destination.Replace("<du>", user, true);
    ReplaceNDU(destination, "");
  }
...

Private Sub Form_Load()
  Dim udtWinsockData As WSAData
  If WSAStartup(&H202, udtWinsockData) <> 0 Then MsgBox Err.LastDllError, vbInformation, "WSAStartup"
End Sub

Private Sub CommandGetAddrInfo_Click()
  Dim localErrNo As Long

  Dim lpAi As Long
  Dim hints As addrinfo
  Dim res As addrinfo

  lpAi = VarPtr(res)

  With hints
    .ai_flags = AI_CANONNAME
    .ai_family = AF_INET
  End With
  
  a2kuStartClock
  Debug.Print Now & Chr(9) & "0" & Chr(9) & "before"
  localErrNo = getaddrinfo(TextNodeName.Text, vbNullString, hints, lpAi)
  Debug.Print Now & Chr(9) & CStr(a2kuEndClock) & Chr(9) & "after"
  MsgBox localErrNo
  'If localErrNo <> 0 Then MsgBox Err.LastDllError, vbInformation, "GetAddrInfo"
End Sub

#include "stdafx.h"
#include <winsock2.h>
#include <ws2tcpip.h>
#include <windows.h>
#include <stdio.h>
#include <time.h>       /* clock_t, clock, CLOCKS_PER_SEC */

// Need to link with Ws2_32.lib
#pragma comment(lib, "ws2_32.lib")



int _tmain(int argc, _TCHAR* argv[])
{
    WORD wVersionRequested;
    WSADATA wsaData;
    int err;
    int localErrNo = NO_DATA;

/* Use the MAKEWORD(lowbyte, highbyte) macro declared in Windef.h */
    wVersionRequested = MAKEWORD(2, 2);

    err = WSAStartup(wVersionRequested, &wsaData);
    if (err != 0) {
        /* Tell the user that we could not find a usable */
        /* Winsock DLL.                                  */
        printf("WSAStartup failed with error: %d\n", err);
        return 1;
    }
    struct addrinfo *res = NULL;
    struct addrinfo hints = { AI_CANONNAME, PF_INET };
    clock_t timer = clock();
    localErrNo = getaddrinfo((const char *)"0074951234567", NULL , &hints, &res);
    printf("getaddrinfo error: %d\n", localErrNo);
    printf("time: %d\n", clock()-timer);

    system("pause"); // Команда задержки экрана
//==========================================

    DWORD dwRetval;
    ADDRINFOEX *resultEX = NULL;
    ADDRINFOEX hintsEX= { AI_CANONNAME, PF_INET };
 

   struct timeval limit= { 0, 300 };
   timer = clock();
#ifndef UNICODE
#define UNICODE
#endif
   dwRetval =
        GetAddrInfoEx((PCWSTR)"0074951234567", NULL, NULL, NULL, &hintsEX, &resultEX,
                       &limit, NULL, NULL, NULL);
    printf("GetAddrInfoEx error: %d\n", dwRetval);
    printf("time: %d\n", clock()-timer);

    system("pause"); // Команда задержки экрана
//==========================================
   timer = clock();
   dwRetval =
        GetAddrInfoEx((PCWSTR)"0074951234567", NULL, NULL, NULL, &hintsEX, &resultEX,
                      NULL, NULL, NULL, NULL);
    printf("GetAddrInfoEx error: %d\n", dwRetval);
    printf("time: %d\n", clock()-timer);

    system("pause"); // Команда задержки экрана

	return 0;
}

int WSAAPI GetAddrInfoEx(
  _In_opt_   PCTSTR pName,
  _In_opt_   PCTSTR pServiceName,
  _In_       DWORD dwNameSpace,
  _In_opt_   LPGUID lpNspId,
  _In_opt_   const ADDRINFOEX *pHints,
  _Out_      PADDRINFOEX *ppResult,
  _In_opt_   struct timeval *timeout,
  _In_opt_   LPOVERLAPPED lpOverlapped,
  _In_opt_   LPLOOKUPSERVICE_COMPLETION_ROUTINE lpCompletionRoutine,
  _Out_opt_  LPHANDLE lpNameHandle
);

      GetAddrInfoEx(TEXT("0074951234567"), NULL, NULL, NULL, &hintsEX, &resultEX,
                      NULL, NULL, NULL, NULL);