[Serusers] SIP Register problem..!

[Santosh Subramanian, Noida]

Hi all,
How to register a sip phone with iptel.org 
how to pass the password while registering with iptel.org
Is there any tag for Authentication like FROM / TO..? 
 
My register request is as follows.. (using which I'm not able to register)
 
REGISTER sip:iptel.org:5060 SIP/2.0
Via: SIP/2.0/UDP 192.168.14.56:5060;branch=z9hG4bK2952839661;rport
From: abcd <sip:abcd at iptel.org>;tag=946143070
To: abcd <sip:abcd at iptel.org>
Call-ID: 320799555 at 192.168.14.56 <mailto:320799555 at 192.168.14.56> 
CSeq: 1 REGISTER
Contact: abcd <sip:abcd at 192.168.14.56:5060>
max-forwards: 50
user-agent: oSIP-ua/0.8.1
expires: 3600
Content-Length: 0

How to add the iptel's username and password with the register message..?
let 
my username is abcd
and password is xyz
 
I tried with CISCO phone (7960) also. Not able to register. 
I have given proxy ip : iptel.org and port : 5060
What values should be given in outbound proxy and port
Enable NAT : yes
 
My phone is working behind firewall & NAT.  Whether the nathelper module is
enabled by iptel.org by default..? 
Or I have to take care of the messages with NAT modifications..? I can send
and receive messages on the same port.
 
Kindly Help.. 
 
With Regards,
Santhosh.S
 
 
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