Calling Tapping at Flash Service Across CS and PS Domains
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Solution Overview
Problem
The existing method for implementing Calling Tapping at Flash service in packet voice networks is limited, as it cannot effectively handle cases where users in the legacy CS domain have voice mailboxes in the PS domain, leading to increased memory overhead, reduced processing capacity, and inconvenience to users, due to the need for SIP terminals to support voice message subscriptions and periodic instance updates.
Innovation Solution
A method and communication system that actively initiate SIP messages from the Voice Mail Application Server to user terminals, converting these messages into inter-exchange signaling messages for the CS domain, allowing notification through existing prompt means, such as display or cue tone, without requiring subscription instances or special SIP terminal support, using MIME bodies in SIP messages to transmit voice message information across domains.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If SIP terminals are required to support voice message subscriptions and periodic instance updates, then Calling Tapping at Flash service can be implemented in PS domain, but memory overhead increases and processing capacity decreases
Solution Approach 1:
The patent extracts the subscription instance management function from the SIP terminal and relocates it to the network side (supplementary service control unit). This eliminates the need for SIP terminals to maintain subscription instances locally, thereby reducing terminal memory overhead and processing burden while preserving service implementation capability.
Solution Approach 2:
The patent introduces a supplementary service control unit as an intermediary between the SIP terminal and the voice mail system. This intermediary handles subscription management and message notification centrally, allowing terminals to operate without maintaining subscription instances, thus resolving the contradiction between service capability and resource consumption.
2Adaptability or versatility
If SIP terminals are required to support voice message subscriptions, then Calling Tapping at Flash service can be implemented in PS domain, but device complexity increases
Solution Approach 1:
The patent extracts the complex subscription management functionality from the SIP terminal and relocates it to the network side. This allows legacy terminals without SIP subscription capability to access the service, reducing device complexity requirements while maintaining service implementation capability.
Solution Approach 2:
The supplementary service control unit is designed to handle multiple functions including subscription management, message notification, and interworking between CS and PS domains. This universal network-side component enables diverse terminals to access the service without requiring each terminal to implement complex subscription logic.
3Adaptability or versatility
If users in legacy CS domain access voice mailboxes in PS domain, then network interoperability is achieved, but no network device can initiate subscriptions on behalf of users
Solution Approach 1:
The supplementary service control unit acts as an intermediary that initiates subscriptions on behalf of legacy CS domain users. It receives voice message notifications from the PS domain voice mailbox and converts them into appropriate notifications for CS domain terminals, enabling cross-domain access without requiring CS terminals to have subscription capability.
Solution Approach 2:
The system implements automatic subscription management where the supplementary service control unit autonomously handles subscription initiation and maintenance for users accessing across domains. This self-service mechanism eliminates the need for manual user intervention or complex user-side configuration.
Data Source
AI summary
The invention discloses a method for implementing Calling Tapping at Flash, which includes the steps of: when there is a new voice message for a user, actively initiating an SIP message carrying the description information of the voice message by a Voice Mail Application Server; sending the SIP message to the user terminal or the home network device of the user by the Voice Mail Application Server, and notifying the user by the user terminal or the network device; converting the SIP message into an inter-exchange signaling message in CS domain and transmitting it to the CS domain where the user accesses by a Media Gateway Control Unit (MGCU), and notifying the user by a switching control unit in the CS domain in accordance with the prompt means of Calling Tapping at Flash of the user. The invention also discloses a communication system for implementing Calling Tapping at Flash service.