Hi I try register DN from source code as below but my softphone not register
        private void button1_Click(object sender, EventArgs e)
        {
            //Login
            try
            {
                LoginButton.Enabled = false;
                RequestRegisterAddress requestRegisterAddress =
                    RequestRegisterAddress.Create(
                        thisDn,
                        RegisterMode.ModeShare,
                        ControlMode.RegisterDefault,
                        AddressType.DN);
                int uniqueId = GenerateUniqueId();
                requestRegisterAddress.ReferenceID = uniqueId;
                requestRegisterAddress.Extensions = new KeyValueCollection();
                //requestRegisterAddress.Extensions["CPNDigits"] = "2503";
                requestRegisterAddress.Extensions["CPNDigits"] = "761001";
                mProtocolManager[tServerName].Send(requestRegisterAddress);
                RequestHash.Add(uniqueId, "RequestRegisterAddress");
                LogoutButton.Enabled = true;
                MessageBox.Show("Login complete ");
            }
            catch (ProtocolException protocolException)
            {
                MessageBox.Show("Protocol Exception!\n" + protocolException);
            }
        }
---------------------------------------------------------------------------------------------------
TServer Log 
@12/26/10@20:30:42.936 **** PBX::SystemStatus ****
12/26/10@20:30:42.952 link (link-tcp) S->H: System status request (id=899 [2]) from PBX (0[0 / 0] requests pending)
20:30:55.139 Trc 04521 New client 368 connected from '192.168.0.9'
20:30:55.139 {connection {accepted} {socket 368} {remote-host 192.168.0.9} {remote-port 2811} {listener {port-id default} {socket 336}}}
20:30:55.264 Trc 04541 RequestRegisterClient received from [368]
message RequestRegisterClient
	AttributeApplicationPassword	''
	AttributeApplicationName	'test'
	AttributeSessionID	0
	AttributeProtocolVersion	'tserver protocol 4.2'
20:30:55.264 Trc 04522 Client [368] authorized, name 'test', id=00000004
12/26/10@20:30:55.264 +++ RqHandler::RequestRegisterClient +++
  got message from client <4>
@20:30:55.2640 [0] 7.6.002.00 send_to_client: message EventLinkConnected
	AttributeApplicationName	'Tserver'
	AttributeSessionID	7995395
	AttributeUserData	[2] 00 00..
	AttributeRegistrationCode	0
	AttributeEventSequenceNumber	0000000000000034
	AttributeServerStartTime	4d16d114000a3d18 (12:22:28.671000)
	AttributeTimeinuSecs	264000
	AttributeTimeinSecs	1293370255 (20:30:55)
20:30:55.264 Trc 04542 EventLinkConnected sent to [368] (00000004 test 192.168.0.9:2811)
--- RqHandler::RequestRegisterClient ---
20:31:04.499 Trc 04541 RequestRegisterAddress received from [368] (00000004 test 192.168.0.9:2811)
message RequestRegisterAddress
	AttributeExtensions	[22] 00 01 00 00..
		'CPNDigits'	'761001'
	AttributeReferenceID	2
	AttributeAddressType	1 (DN)
	AttributeControlMode	0
	AttributeRegisterMode	0
	AttributeThisDN	'765001'
@20:31:04.4990 [ISCC] Client location test:00000004@ added
20:31:04.499 Trc 20006 Number of seat licenses in use 3 out of 9999 available
(tservice_proc) AddressType changed to 2 for 765001 based on CME
(tservice_proc) ControlMode set to 1 for 765001
12/26/10@20:31:04.499 +++ RqHandler::RequestRegisterAddress +++
  got message from client <4>
  device <765001> cannot be monitored - could be a real agent
@20:31:04.4990 [0] 7.6.002.00 send_to_client: message EventError
	(Bad DN type for DN registration)
	AttributeEventSequenceNumber	0000000000000035
	AttributeTimeinuSecs	499000
	AttributeTimeinSecs	1293370264 (20:31:04)
	AttributeErrorMessage	'Bad DN type for DN registration'
	AttributeErrorCode	128
	AttributeUserEvent	RequestRegisterAddress
	AttributeClientID	4
	AttributeControlMode	1
	AttributeAddressType	2 (Position)
	AttributeExtensions	[22] 00 01 00 00..
		'CPNDigits'	'761001'
	AttributeReferenceID	2
	AttributeRegisterMode	0
	AttributeThisDN	'765001'
20:31:04.499 Int 04545 Interaction message "EventError" sent to 368 ("test")
20:31:04.499 Trc 04542 EventError sent to [368] (00000004 test 192.168.0.9:2811)
--- RqHandler::RequestRegisterAddress ---
@12/26/10@20:31:13.030 **** PBX::SystemStatus ****
link (link-tcp) S->H: System status request (id=89b [2]) from PBX (0[0 / 0] requests pending)