My personal cell
phone subscribes to voice, data, picture services, instant messaging, and location-based
services (LBS).
Visited networks also access this information when authenticating a subscriber. This
is how a visited network determines whether a subscriber is allowed to access the
network and use its services. This is another reason for IMS; allowing other networks
to share information about a subscription and verify whether or not the subscriber is
allowed access to these services.
One of the pitfalls of today??™s telecommunications networks is the inability to use
services while roaming. For example, if I use my cell phone in another country, I cannot
use the data service, nor can I use the LBS service. This is because the service providers
in the areas I visit do not have the platforms to support these services, and if they did,
they would not be compatible with my device.
The concept in the IMS is to allow these other networks to access the application
servers in my home network so that they can support the same services I enjoy at home
in their networks. My home network provider is then able to earn additional revenues
by allowing access to these services to other ???trusted??? domains, extending my service
to any areas I visit.
This concept also came from the wireless world, specifically GSM, where roaming information
is shared between roaming partners.
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