[FEATURE] Native call holding & queueing.

[cybex-dev]

I am developing a native call "holding" feature - this ticket/issue is aimed at development considerations, potential issues or insight into this feature.

I intend this as a discussion for development.

Describe the solution you'd like
Customer requires the SDK to serve the purpose of a CallKit, as found on iOS whereby a call can be answered and:

• placed on hold,
• swapped in-place of active call,
• merged with active call

The intended use-case is a web softphone for customer/clients to call from a web platform, merge multiple calls or in a call-centre environment to "queue" calls.

This feature provides the developer a browser client solution to call holding, as found on an Android ConnectionService or iOS CallKit implementation

Describe alternatives you've considered
See this discussion for further information and context, specifically adding a back backend-based solution with a conference call implementation.

Several discussions/issues on StackOverflow & GitHub issues explore the above solution in more details:

• Add hold functionality for incoming and outgoing calls #32
• Place a Twilio call on hold and retrieve it later
• How to call, Hang up, put on hold and unhold calls using Twilio?
• Transform a Twilio call into conference

Additional context
Since this same functionality can be found in both native Android & iOS implementations, one would reasonably expect this to extend to the web client aswel.

(previously closed issue on twilio-client.js)

[charliesantos]

Closing this now. We're tracking this feature request internally. Please feel free to follow up if needed.