Issue while Registering with Multiple Contacts

Hi All,

   I am having a problem while registering the multiple contacts from the same endpoint.

   I had constructed the SipRegister Request with the Two Contact header as shown below. But I was able to Register only with the first contact and not with the Second Contact. 

REGISTER sip:200.201.202.72 SIP/2.0
Call-ID: 9fc2c53e2efc16c04e1d0fdadd354c4c@0.0.0.0
CSeq: 1 REGISTER
From: “14084310763” sip:14084310763@200.201.202.72;tag=6e526cc4
To: “14084310763” sip:14084310763@200.201.202.72
Via: SIP/2.0/UDP 200.201.202.56:5060;branch=z9hG4bK709c4960748d8c1f6dd91eaf40f14729
Max-Forwards: 70
Route: sip:200.201.202.72;lr;transport=udp
User-Agent: xxxxxxxx 1.2.7 Tue_Aug_12_11-05-19_IST_2008
Expires: 3600
Contact: “14084310763” sip:14084310763@200.201.202.56:5060;transport=udp;expires=3600,“18002837674” sip:18002837674@200.201.202.56:5060;transport=udp;expires=3600

Content-Length: 0

But I got the Respone with only one contact Registered as shown below :

Tue Aug 12 11:05:19 IST 2008: received response=
SIP/2.0 100 Trying
Via: SIP/2.0/UDP 200.201.202.56:5060;received=200.201.202.56;branch=z9hG4bK709c4960748d8c1f6dd91eaf40f14729
From: “14084310763” sip:14084310763@200.201.202.72;tag=6e526cc4
To: “14084310763” sip:14084310763@200.201.202.72
Call-ID: 9fc2c53e2efc16c04e1d0fdadd354c4c@0.0.0.0
CSeq: 1 REGISTER
User-Agent: Asterisk PBX
Allow: INVITE,ACK,CANCEL,OPTIONS,BYE,REFER,SUBSCRIBE,NOTIFY
Supported: replaces
Contact: sip:14084310763@200.201.202.72
Content-Length: 0

   What should I have to do to make my second contact getting Registered?

Thanks,
Vinoth Kumar.