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IMS: Moving from legacy to convergence

Telecom network operators have learned some good lessons over the years while trying to deploy cost-effective intelligent networks. In the new book, The IP Multimedia Subsystem (IMS) by Travis Russell (McGraw-Hill, 2007), the author discusses migrating from legacy networks to an all-IP network in planned phases rather than "flash cutting" the entire network.

In this chapter download, Moving from legacy to convergence, Russell examines how operators around the world are transitioning to IMS and offers his view of a plan that makes solid business sense. Russell takes the point of view that the transition to IMS shouldn't happen overnight because so many legacy systems have to interoperate with the IMS network as it is implemented. Russell argues for a transitional approach that eventually will lead to full IMS integration – with all services using one common architecture and one common signaling method. The payoff at the end will be a simplified network and services for wireless and wireline carriers.

In this chapter, you'll find in-depth information on:

  • Migrating the backbone to an IP-based network
  • Deploying VoIP as a growth strategy
  • Deploying IMS
  • Interworking between the legacy network and IMS
  • Migrating the OSS/BSS
  • Interfacing to the IMS
  • General Packet Radio Service (GPRS)
  • UMTS and CDMA domains
  • From IMS to IMS

Download Chapter 2, Moving from Legacy to Convergence

Excerpted with permission from the McGraw-Hill Companies from The IP Multimedia Subsystem (IMS) by Travis Russell (McGraw-Hill; 2007).


This was first published in December 2007

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