BS2VoipConfigExt config = Util.AllocateStructure<BS2VoipConfigExt>();

config.enabled = Convert.ToByte(1);
config.useOutboundProxy = Convert.ToByte(0);
config.registrationDuration = 300;

string strIpAddr = "192.168.0.9";
byte[] arrIpAddr = Encoding.UTF8.GetBytes(strIpAddr);
Array.Clear(config.address, 0, BS2Environment.BS2_URL_SIZE);
Array.Copy(arrIpAddr, 0, config.address, 0, arrIpAddr.Length);
config.port = 5060;

config.volume.speaker = 50;
config.volume.mic = 50;

string strSIPID = "myAccount";
byte[] arrSIPID = Encoding.UTF8.GetBytes(strSIPID);
Array.Clear(config.id, 0, BS2Environment.BS2_USER_ID_SIZE);
Array.Copy(arrSIPID, 0, config.id, 0, arrSIPID.Length);

string strSIPPW = "myPassword";
byte[] arrSIPPW = Encoding.UTF8.GetBytes(strSIPPW);
Array.Clear(config.password, 0, BS2Environment.BS2_USER_ID_SIZE);
Array.Copy(arrSIPPW, 0, config.password, 0, arrSIPPW.Length);

string strAuthCode = "1234";
byte[] arrAuthCode = Encoding.UTF8.GetBytes(strAuthCode);
Array.Clear(config.authorizationCode, 0, BS2Environment.BS2_USER_ID_SIZE);
Array.Copy(arrAuthCode, 0, config.authorizationCode, 0, arrAuthCode.Length);

config.exitButton = Convert.ToByte('0');  // keypad 0
config.showExtensionNumber = Convert.ToByte(true);
config.numPhoneBook = 2;

string strPhoneNum = "600";
byte[] arrPhoneNum = Encoding.UTF8.GetBytes(strPhoneNum);
Array.Clear(config.phonebook[0].phoneNumber, 0, BS2Environment.BS2_USER_ID_SIZE);
Array.Copy(arrPhoneNum, 0, config.phonebook[0].phoneNumber, 0, arrPhoneNum.Length);
string strPhoneDesc = "LB James";
byte[] arrPhoneDesc = Encoding.UTF8.GetBytes(strPhoneDesc);
Array.Clear(config.phonebook[0].description, 0, BS2Environment.BS2_VOIP_MAX_DESCRIPTION_LEN_EXT);
Array.Copy(arrPhoneDesc, 0, config.phonebook[0].description, 0, arrPhoneDesc.Length);
strPhoneNum = "601";
arrPhoneNum = Encoding.UTF8.GetBytes(strPhoneNum);
Array.Clear(config.phonebook[1].phoneNumber, 0, BS2Environment.BS2_USER_ID_SIZE);
Array.Copy(arrPhoneNum, 0, config.phonebook[1].phoneNumber, 0, arrPhoneNum.Length);
strPhoneDesc = "C Kershaw";
arrPhoneDesc = Encoding.UTF8.GetBytes(strPhoneDesc);
Array.Clear(config.phonebook[1].description, 0, BS2Environment.BS2_VOIP_MAX_DESCRIPTION_LEN_EXT);
Array.Copy(arrPhoneDesc, 0, config.phonebook[1].description, 0, arrPhoneDesc.Length);

BS2ErrorCode result = (BS2ErrorCode)API.BS2_SetVoipConfigExt(sdkContext, deviceID, ref config);
if (result != BS2ErrorCode.BS_SDK_SUCCESS)
{
	Console.WriteLine("Got error({0}).", result);
}