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If you choose to implement your own web phone from scratch using the WebRTC, you need to implement a lot.

Here is an alternative with the RingCentral Embeddable. Simply add the code below to your page (e.g. the Default.aspx)

<span><a href="#" onclick="makeCall('13129822345')">+13129822345</a></span>
<iframe width="300" height="500" id="rc-widget" allow="microphone" src="https://ringcentral.github.io/ringcentral-embeddable/app.html">
</iframe>
<script>
    function makeCall(number) {
        document.querySelector("#rc-widget").contentWindow.postMessage({
                type: 'rc-adapter-new-call',
                phoneNumber: number,
                toCall: true,
                }, '*');
    }
</script>