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Development of applications based on call/session signalling such as SIP is limited as it requires software programmers to possess detailed knowledge of telecommunications technologies. In addition, this type of application development leads to a telecommunications application layer with limited structure. This paper proposes a service development approach based on direct interaction between a terminal and application server, thereby circumventing the reliance on service messages traversing call/session entities within the network. This approach results in the transfer of service development into an application layer with suitable abstractions.
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