Hi,
I am able to register with iptel.org. Is there any test numbers to confirm whether my sip-phone works / not..?
my id is <sip:san@iptel.org>  and my peers id is <sip:dheeraj@iptel.org>
 
If both the phones are behind NAT, How to send SDP messages from UAC to UAS..?
Thankyou.
 
Kind Regards,
Santhosh.S