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This is a concept that the 3GPP introduced to be used within IMS networks. In a SIP network, a proxy is able to use any available route. The routing decisions are made in real time by each of the routers in the path, based on current availability and traffic conditions. This means that a request may take one path, while its responses may take another path. This, of course, makes it impossible to trace any of the messages or to capture all of the messages related to one session without capturing everything in the network and using a correlation engine to associate each of the requests/responses. The exception to this rule is when stateful proxies are used, since a stateful proxy must see every response for a request in order for the proxy to be able to monitor the state of the session. If the proxy does not see all of the responses, it will not be able to determine if the request was successful, and it will not be able to determine whether or not a session was terminated (unless it sees the relevant messages). Because of this type of deterministic routing, hackers are able to use man-inthe-middle attacks to intercept sessions and have them rerouted to another address. They are able to use replay to send copied messages back into the network without detection, even if they suddenly route responses to a different address than what was registered. With strict routing, the routing path is recorded as the subscriber registers in the network. The REGISTER message contains the RECORD-ROUTE headers, used to collect the addresses of each of the proxies in the path. These addresses are saved in the order they were added, so that a route list can be established for the subscriber. The route list then becomes part of the subscriber s registration. Stateful proxies in the path then also store the route list for the subscriber so that they know how to route
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Security in a SIP Network
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messages (both requests and responses) to the user identity. Even if a hacker attempted a session hijack, for example, the proxies would ignore the routing provided in the message, relying instead on the route list they recorded for the subscriber during the registration. The hacker then would have to hijack a registration and successfully register his or her own address using the subscriber identity. This is still possible, unless the network is using encryption and authentication keys, in which case the hacker would be unable to read the intercepted messages (thereby being prevented from capturing the user identity) and would be unable to pass through authentication (not having the proper authentication keys). Strict routing does have its drawbacks, though. This is not a very efficient means of network routing because it forces traffic through specific paths regardless of network utilization at that specific time. This means the network will have load imbalance, and many facilities may sit idle during certain periods of the day. This, of course, goes against the grain of IP networks, where routing is determined according to the network conditions. It does align more with the circuit-switched network procedures, so switching engineers will be very comfortable with this form of routing, but IT engineers will not be so thrilled about strict routing. If used with all of the other approaches we have talked about so far, this will certainly make the network a very robust and well-protected network. Nothing is perfect, and there is no such thing as a totally secure network as we have seen demonstrated time and time again. But remember that the object to security is to make it difficult for the hacker to fool the network, while allowing your subscribers to enjoy an easy and feature-rich, yet secure network experience.
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