Customized Ringing Signal Policy Filtering for Dual-Subscriber IMS Calls
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Solution Overview
Problem
Conventional Customized Ringing Signal (CRS) services in the IMS domain do not specify how to trigger the service when both the caller and callee have subscribed, and lack functionality for users to selectively experience CRS tones, leading to passive perception without user discretion.
Innovation Solution
A method and apparatus for implementing CRS services that include receiving a call request, obtaining a policy for playing or filtering CRS tones, and executing the policy to play or filter tones accordingly, with a callee terminal equipped with a filter policy configuring unit and parsing unit to set and apply policies for tone selection and filtering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If both caller and callee subscribe to CRS service, then CRS service coverage is improved, but service triggering ambiguity occurs without specified trigger mechanism
Solution Approach 1:
The patent applies local quality by assigning different CRS service capabilities to different network entities. The caller's network side can subscribe to caller CRS service while the callee's network side can subscribe to callee CRS service, allowing each side to have customized ringback tones independently. This resolves the triggering ambiguity by enabling selective service activation based on local subscription status rather than requiring a unified trigger mechanism for both parties.
Solution Approach 2:
The patent implements dynamics by making the CRS service triggering flexible and adaptive. The system dynamically determines which CRS service to trigger based on real-time subscription status of both caller and callee. The network side can adaptively select between caller CRS service and callee CRS service according to the specific call scenario and subscription configuration, rather than using a fixed trigger mechanism.
2Adaptability or versatility
If CRS tones are played to all users, then CRS service availability is improved, but user perception becomes passive without selective experience
Solution Approach 1:
The patent applies preliminary action by enabling users to pre-configure their CRS service preferences and subscription status before actual calls. Users can advance subscribe to caller CRS service or callee CRS service, and pre-set their preferred ringback tone selections. This preliminary configuration allows the system to automatically apply the user's preferences during calls, transforming passive tone reception into active user-directed experience without requiring real-time control during calls.
Data Source
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AI summary
A method for implementing Customized Ringing Signal (CRS) services is provided. The method includes: receiving a call request initiated by a caller terminal; obtaining a policy of playing a CRS tone according to the call request, where the policy is a policy of playing a CRS tone, namely, a caller CRS tone or a callee CRS tone, or a policy of filtering the CRS tone: and playing the CRS tone to a callee according to the policy. By setting a policy of playing the CRS tone to the callee in the network or the callee terminal, the users enjoy the CRS services at their own discretion.