Twilio Call Transfer Example

Contrived but short example on how to create series of browser softphones using Twilio, Twilio Client's APIs and transfer incoming PSTN calls between them.

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####Requirements

• Flask
• Twilio Python library
• A public facing host

Documentation

This project exposes 3 different endpoints

/client/<client_name>

Displays a page with a Twilio Client under the client name: <client_name>

Calls directed to the client named, <client_name> will ring the browser showing this page.

The following TwiML calls the Twilio Client on /client/alice

<Response>
    <Dial>
        <Client>alice</Client>
    </Dial>
</Response>

/incoming_voice_url/<client_name>

Used as the Voice URL for your Twilio Number to forward all calls made to that number to the designated <client_name>

/transfer_call/<from_client>/to/<to_client>

Called within a Javascript AJAX call to transfer the current call from <from_client> to <to_client>

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Installation

1. Clone the repository
2. Edit TWILIO_ACCOUNT_SID and TWILIO_AUTH_TOKEN
3. Added http://<server>/incoming_voice_url/alice as your phone number's Voice URL in the Twilio Dashboard
4. Open 2 browser windows to http://<server>/client/alice and http://<server>/client/bob
5. Call in to your Twilio number and Alice's browser phone will ring and click on the transfer to Bob button.