iframe Customization

Hi, so I'm integrating ringCentral in my website, and I'm using iframe tag to use the embeddable voice features. Is there a way to automatically login instead of prompting the user to enter the username and password?

<iframe width="250" height="600" allow="microphone" src="https://ringcentral.github.io/ringcentral-embeddable/app.html?appServer=https://platform.devtest.ringcentral.com"></iframe>

and one more thing can I customize it to disable the calling settings foe example as shown in the bellow image?