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Additional resources for The IP Multimedia Subsystem (IMS)
Example text
Since signaling (SS7 specifically) is already packet data, there is no need to convert the signaling data to packet. However, the SS7 protocol relies on transport protocols that were developed for use on TDM facilities. The transport layers of SS7 (the Message Transfer Part) will not support IP facilities and therefore must be replaced with a new transport protocol before SS7 can be transported via IP. Moving from Legacy to Convergence 31 This was the work of the IETF, which developed the SIGnaling TRANsport (SIGTRAN) protocol.
It involves so much more than simply launching a few platforms, connecting up the circuits, and calling it a network. There are countless systems and applications that are all connected in some fashion to the network as well as the various network elements. These systems must somehow interoperate with all the other systems and applications, to ensure a seamless transition. Throughout the entire process of transitioning the network, the operator must somehow ensure that subscribers never experience a degradation in service, and that all investments are protected and future-proof.
Topology hiding entails removal of certain SIP headers to prevent other networks from learning about the network. For example, the ROUTE header contains addresses of all the IMS entities that were used to route the message. These could be used to identify the number of hops to the S-CSCF, as well as other “proprietary” network information that the operator may not want to share with another network. If a hacker were able to capture all of the SIP messages using a protocol analyzer (or other method of sniffing on the network), the hacker could also use this information to determine round trip time in the network and calculate other parameters that could Architecture of the IMS 15 then be used in a denial of service attack.