This unit will cover how to set up three-way conference calls with Fastcall. This is necessary to use the Fastcall features listen-in and warm call transfers but does have some trade-offs.
Introduction
Fastcall uses three-way conference calls to power two features: listen-in and warm call transfers. A conference call is handled differently from a normal call by Twilio and costs more than normal 2-leg calls.
Fastcall Listen In (discussed in the next unit) requires the call to start as a conference call so that the manager or trainer can join the call at any time during the call. All calls (to given Users) will be started as three-way conference calls. When an inbound or outbound call is made, a conference is started and two participants are added. Then, when the listening user joins, a third conference participant is added. Warm transfers also use 3 legs, but these conference calls are created on-demand.
Cost implications
Turning on this feature will increase the cost of calls. As well as charging for each call connected to the conference, Twilio will charge a per-minute fee for the conference itself. This means that the per-minute call costs will be higher when using this feature.
Complexity implications
Whilst the functionality is stable and proven, conference calls are inherently more complicated than normal calls – there are more participants, and Twilio is doing more work behind the scenes. This means there’s more to break.
Consider who needs this
Consider alternatives to listen-in and warm call transfer, such as reviewing call recordings and cold transfers. You can also limit which users or groups get access to this functionality.
Enabled for
You can select a specific User or Group for three-way conference calls. As mentioned, conference calls behave differently from normal calls, so you may wish to limit which Users get this functionality.
Audio settings for 3 way call
It’s recommended that you set some audio, otherwise, call participants may think they have been disconnected while Twilio makes the other connections involved in the conference call. You do not want silence in this setting.
Last updated: Fastcall version 8.3.5, 2023-11-16