[Serusers] No incoming calls, why..

[Santosh Subramanian, Noida]

Hello,
I have installed cisco phone (7960) and another SIP phone in the local
network which is behind firewall. 
I'm able to register both the phones with different usernames of iptel.org
I have tested both the phones seperately with echo tester. Thats working.
 
But, I am not able to make call from cisco phone to my sip phone and vice
versa.
I am not getting any response for the invite. Not even 100 trying.
Is it because both the phones are working behind nat/firewall or some other
reason.
 
can anybody in the public ip try san at iptel.org <mailto:san at iptel.org>   or
dheeraj at iptel.org <mailto:dheeraj at iptel.org>  ..?
 
Kind Regards,
Santhosh.S
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