How do I make a conference call using Plivo?

Conference calls can be started in three ways: 

  • During an outbound call
  • During an inbound call
  • You can also move participants from a normally bridged call to a conference call

During an outbound call

Use the HTTP call API: 

An outbound call can be triggered by a number or an endpoint. When the dialed party answers the call, the answer_URL of the API has to return a conference XML (see the example below) so as to put the dialed party to the conference room “My Room.” 


<Conference>My Room</Conference>


During an inbound call 

During an inbound call to a Plivo DID, the answer_URL of the application attached to the DID should return the conference XML (see below). This will add the caller to the conference room - My Room


<Conference>My Room</Conference>


From a normally-bridged call to conference call:

The participants of a normal call can be transferred from the bridged call to a conference call with the help of our transfer a call API (

To get the call_UUID of the live call and to needed to record the inbound call, please use one of these APIs:

What is the maximum number of participants allowed in a single conference?

A maximum number of 20 participants/members are allowed in a single conference room.

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