Push-to-talk Answer Mode Override via SIP Signaling
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Solution Overview
Problem
Current Push-to-Talk Over Cellular (PoC) services lack a mechanism to override an auto-answer mode setting, which can lead to unwanted voice playback to others, especially when privacy is desired during calls or when joining ongoing sessions.
Innovation Solution
Incorporating a manual answer mode request in session invitations sent from a calling party, which is forwarded to the called party's server regardless of their auto-answer setting, allowing for an override of the auto-answer mode and generating an alert at the called party's terminal, using Session Initiation Protocol (SIP) for signaling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If auto-answer mode is implemented for incoming sessions, then session establishment speed is improved, but privacy control is worsened due to unwanted voice playback to others
Solution Approach 1:
The system dynamically switches between auto-answer mode and manual answer mode based on real-time user input. When a user presses a key during the ringing alert period, the system transitions from automatic answering to manual control, allowing the user to override the auto-answer setting and prevent unwanted voice playback while maintaining fast session establishment when privacy is not a concern
Solution Approach 2:
The system changes the answer mode parameter from fixed auto-answer to configurable manual mode by detecting user input during the ringing alert. This parameter change enables the system to adapt its behavior based on user needs, allowing fast connection when auto-answer is used and privacy protection when manual mode is activated through key press input
2Object-affected harmful factors
If manual answer mode is used, then privacy control is improved, but session establishment time is worsened due to user interaction requirement
Solution Approach 1:
The system performs preliminary action by sending the ringing alert immediately upon receiving the INVITE message, before waiting for user input. This allows the user to press a key quickly to switch to manual mode, minimizing the time loss while still providing privacy control. The ringing alert is sent as soon as the calling party initiates the session, giving the called party immediate opportunity to respond
3Ease of operation
If white list auto-answer is implemented, then convenient communication is improved, but flexibility is worsened due to inability to override auto-answer settings
Solution Approach 1:
The system makes the answer mode dynamic by allowing real-time switching between auto-answer and manual mode through user input during the ringing alert. This resolves the contradiction by maintaining the convenience of white list auto-answer for trusted contacts while adding the flexibility to override the setting when privacy or other considerations require manual control
Solution Approach 2:
The system segments the answer mode into two distinct states: auto-answer mode for convenient communication with white list contacts, and manual mode for flexible control when needed. The segmentation is achieved through the key press detection mechanism that divides the session establishment process into automatic and manual phases, allowing users to switch between modes based on their immediate needs
Data Source
AI summary
A method of operating a push-to-talk service over a mobile wireless communication network, where a user of a mobile wireless terminal may select an automatic or manual answer mode for incoming session invitations for at least some other users. The method comprises including in the push-to-talk session invitation sent from a calling party to a called party, a manual answer mode request, upon receipt of the session invitation at a push-to-talk server serving the called party, forwarding the invitation including the manual answer mode request to the called party regardless of any auto-answer mode setting for the called party, and receiving the invitation at the called party, and generating a ringing alert at the called party's terminal.