There are few approaches available
1. STUN Simple Traversal of User Datagram Protocol (UDP)
Through Network Address Translators (NATs) RFC 3489
Here you have STUN server behind NAT, and you STUN client (usually
embedded in SIP UA) which asks for NAT type/IP:port mapping the
server
2. UPnP (Universal Plug and Play)
A client can ask the NAT how it would map a particular IP:port through a protocol
called Universal
Plug and Play (UPnP). This is a solution that is being pushed by Microsoft (among
others). The
client queries the NAT via UPnP asking what mapping it should use if it wants to
receive on port
x. The NAT responds with the IP:port pair that someone on the public Internet should
use to reach
the client on that port. Many NAT device manufacturers have already included UPnP in
their
products.
If have questions about 1st, I could answer, but I'm not familiar with
2. and other (there are others)
Wednesday, November 19, 2003, 11:34:21 AM, you wrote:
SSN> Hello all,
SSN> I'm trying to use the sip phone to communicate with external world.
SSN> Scenario is I'm behind the firewall and I need to get a global ip from
SSN> the NAT, to do that.
SSN> Scenario
SSN> --------
SSN> private IP address range :
SSN> 10.0.0.x :
SSN> :
SSN> : xxx.org
SSN> +-------------+ +-----------+ +-------------+
SSN> ! !.10 ! NAT / ! publicIP !
SSN> ! IntHost !-----------! Firewall !----------->>! externalHost!
SSN> ! ! eth0 ! ! ppp0 !
SSN> +-------------+ +-----------+ +-------------+
SSN> user: x : user: test
SSN> :
SSN> :
SSN> My problem is, How will the UA connected in IntHost, gets the publicIP from
SSN> NAT?
SSN> what kind of query it should send to NAT..? Once the UA knows the PublicIP
SSN> only
SSN> it can update the sdp params and contact fields with PublicIP values (before
SSN> it
SSN> sends packet to proxy). whether my approach is correct or not? How to do
SSN> this?
SSN> Kind Regards,
SSN> Santhosh.S
SSN> _______________________________________________
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SSN> [EMAIL PROTECTED]
SSN> http://lists.cs.columbia.edu/mailman/listinfo/sip-implementors
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