[VOIPSEC] SIP B2BUA and Digest Authentication using

[Simon Horne]

At 02:52 PM 8/11/2005, satyam tyagi wrote:

>Hi Simon,
>
>Sorry for the late response, I was out for few days.
>
>Maybe myquery was not clear
>
>I meant to ask when EP1 calls EP2 and EP2' where the SIP/dialled address 
>of EP2 and EP2' are same but the IP addresses are different. Say Vonage 
>hard phone EP2 and soft phone EP2' installed on a laptop, when someone 
>calls, both phones ring.
>
>Hopefully this clarifies.
>
>My question was in such a scenario, are two seprate keys negotiated 
>EP1-EP2 and EP1-EP2' and based on where the call is answered appropriate 
>key is used by EP1?

Good point, I don't think that scenario is even possible in H.323, You 
cannot register 2 entities with the same alias, the server should reject 
the second registration, even if 2 servers where used, the routing policy 
should only return 1 address to EP1 to call.. An EP may use 2 different IP 
addresses but only 1 IP address is used at a time to attempt the connection.
Simon



Simon Horne
Director
Packetizer Labs
www.packetizer.com/labs