This approach ensures
subscribers continue enjoying the services they have now, while providing them the opportunity
to enjoy new multimedia services, without abandoning any part of the network.
This certainly makes the best business sense. Simply ???turning away??? from the legacy
network and dumping all your investment into an IP infrastructure is not smart business;
it quickly strands your core subscribers on the legacy side with non-competitive services.
Operators need the ability to continue offering their legacy customers new, innovative,
and competitive services through strategic investments in their legacy networks.
At the same time, new services should be offered on IMS-ready platforms to prevent the
stranding of those investments. This ensures the platforms the operator invests in will
make long-lasting investments supporting an all-IMS environment when the time comes.
Most will agree that if a legacy network exists, the best approach is to transition from
an IN-based network to IMS. This is much easier to accomplish in the long run when
using solutions available today to bridge between the old and the new. The sections
that follow provide more detailed information about how these networks interoperate
with one another.
Interworking Between the Legacy Network and IMS
Within the core network there are two parts of the network that must be supported.
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