Call Stored Procedure from SQL 2008 using PHP

[genosy]

hi, Am having a problem Inserting into SQL 2008 database using stored procedure from a php webpage.

My Stored Procedure is:

Create PROCEDURE [dbo].[udp_AddContact_Insert]
			@Contact_ID int,
			@Client_ID int,  	
			@STD varchar(10), 
			@Tel varchar(20), 
			@Mobile varchar(20),
			@EmailAddress varchar(100),
			@FirstName varchar(20),
			@LastName varchar(20),
			@Title_ID int, 
			@Position_ID int, 
			@User_ID int, 
			@SourceURL varchar(1000), 			
			@PositionText varchar(200),
			@TitleText varchar(50), 
			@NewContact_ID int output 

AS

BEGIN
	SET NOCOUNT ON

	IF LEN(@PositionText)>0 BEGIN
		INSERT INTO	dbo.tblPosition (Position) VALUES (@PositionText)
		SET @Position_ID = @@identity
	END

	IF LEN(@TitleText)>0 BEGIN
	        INSERT INTO	dbo.tblTitle ([Client_ID], [Title]) VALUES (@Client_ID, @TitleText)
		SET @Title_ID = @@identity
	END
			
	INSERT INTO [dbo].[tblContact] 
			   ([Client_ID]
			   ,[STD]
			   ,[Tel]
			   ,[Mobile]
			   ,[EmailAddress]
			   ,[FirstName]
			   ,[LastName]
			   ,[Title_ID]
			   ,[Position_ID]
			   ,[User_ID]
			   ,[SourceURL])
		 VALUES
			   (@Client_ID
			   ,@STD
			   ,@Tel
			   ,@Mobile
			   ,@EmailAddress
			   ,@FirstName
			   ,@LastName
			   ,@Title_ID
			   ,@Position_ID
			   ,@User_ID
			   ,@SourceURL
			   )

	SELECT @NewContact_ID = @@identity
	
	DECLARE @Relationship_ID int
	SET @Relationship_ID = 1 --Contact
	
	INSERT INTO [dbo].[tblContact_Related]
           ([Contact_ID], 
           [RelatedContact_ID],
           [Relationship_ID])
     VALUES 
		(@Contact_ID, 
		@NewContact_ID,
		@Relationship_ID)
SELECT Contact_ID FROM dbo.tblContact WHERE [Contact_ID] = @Contact_ID
	
END
GO

And my php code is

$Contact_ID = $_POST['contactID'];
$Client_ID = 1;
$STD = "0";
$Tel = "0";
$Mobile = $_POST['mobile'];
$EmailAddress = $_POST['email'];
$FirstName = $_POST['firstname'];
$LastName = $_POST['lastname'];
if($_Post['titleID']=="")
{$Title_ID = 0;}
else $Title_ID = $_Post['titleID'];
if($_Post['position']=="")
{$Position_ID = 0;}
else $Position_ID = $_Post['positionID'];
$User_ID = 0;
$DateCreated = getdate();
$PositionText = $_POST['position'];
$TitleText = $_POST['title'];
$SourceURL = $_POST['sourceurl'];

$proc2 = mssql_init("dbo.udp_AddContact_Insert", $con);
mssql_bind($proc2, "@Contact_ID", $Contact_ID, SQLINT4);
mssql_bind($proc2, "@Client_ID", $Client_ID, SQLINT4);
mssql_bind($proc2, "@STD", $STD, SQLVARCHAR);
mssql_bind($proc2, "@Tel", $Tel, SQLVARCHAR);
mssql_bind($proc2, "@Mobile", $Mobile, SQLVARCHAR);
mssql_bind($proc2, "@EmailAddress", $EmailAddress, SQLVARCHAR);
mssql_bind($proc2, "@FirstName", $FirstName, SQLVARCHAR);
mssql_bind($proc2, "@LastName", $LastName, SQLVARCHAR);
mssql_bind($proc2, "@Title_ID", $Title_ID, SQLINT4);
mssql_bind($proc2, "@Position_ID", $Position_ID, SQLINT4);
mssql_bind($proc2, "@User_ID", $User_ID, SQLINT4);
mssql_bind($proc2, "@SourceURL", $SourceURL, SQLVARCHAR);
mssql_bind($proc2, "@PositionText", $PositionText, SQLVARCHAR);
mssql_bind($proc2, "@TitleText", $TitleText, SQLVARCHAR);

$result2 = mssql_execute($proc2);

Can anyone help me find my mistakes please.
Thanks

[genosy]

I got no problem retrieving data using a stored procedure, which means, my connection is good. Its only, Inserting data using the stored procedure that is causing me troubles.
:(