Audio Conference Session Transfer With Host Role Continuity
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Solution Overview
Problem
Conventional telephony systems fail to transfer ongoing audio calls from audio-only devices like VOIP softphones to mobile devices without disrupting the call, and they do not support the transfer of call rosters and host capabilities based on user roles.
Innovation Solution
A cloud-based audio call transfer scheme using SIP signaling generates a conference identifier that shares the same indicator as the ongoing call, allowing seamless transfer of calls and associated rosters/host capabilities to mobile devices by confirming identical indicators and updating participant devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional telephony systems transfer ongoing audio calls from VOIP softphones to mobile devices, then call transfer functionality is achieved, but call interruption occurs and call integrity is compromised
Solution Approach 1:
The system performs preliminary actions by establishing a conference bridge before the actual call transfer. The VOIP softphone initiates a conference bridge request, and the mobile device is added to this pre-established bridge, allowing the call to be transferred without interruption since the infrastructure is already in place.
Solution Approach 2:
The conference bridge acts as an intermediary between the VOIP softphone and the mobile device. Instead of directly connecting the mobile device to the existing call (which would cause interruption), the conference bridge mediates the transition, maintaining continuous audio flow while enabling device transfer.
2Adaptability or versatility
If conventional telephony systems transfer audio calls, then device mobility is improved, but call roster and host capabilities cannot be transferred
Solution Approach 1:
The conference bridge serves multiple functions simultaneously: it enables call transfer, maintains the call roster, preserves host capabilities, and supports user role information. This multi-functional approach ensures that when a mobile device joins the conference bridge, it inherits all associated metadata and capabilities without loss.
Solution Approach 2:
The system creates a copy of the call configuration including the call roster, host capabilities, and user roles, and transfers this complete configuration to the mobile device through the conference bridge. This copying mechanism ensures that the mobile device receives a full functional replica of the call state.
3Adaptability or versatility
If users disconnect from audio calls to enable transfer to another device, then transfer capability is achieved, but user convenience is reduced due to interruption
Solution Approach 1:
The conference bridge maintains continuous audio flow during the transfer process. The useful action of audio communication continues uninterrupted while the transfer of call control and metadata occurs in the background through the bridge, eliminating the need for users to disconnect or experience interruption.
Data Source
AI summary
A server of a system is configured to transmit a message from a first device that includes a conference identifier (ID) and a user ID to a second device to connect the second device to an ongoing audio conference bridge call without interrupting the audio conference bridge call. By providing the conference ID and the user ID, host privileges associated with the user associated with the user ID are transferred to the second device. By transferring the host privileges to the second device, the user can, via the second device, view the participant roster and add or remove participants from the audio conference bridge call.