One of the features that I feel sets it apart from Twilio (but that admittedly isn't very well documented) is that you can configure an application to be direct

One of the features that I feel sets it apart from Twilio (but that admittedly isn't very well documented) is that you can configure an application to be direct-dial. In layman's terms, you can use Plivo via SIP for an internal phone system and configure how different numbers/extensions are handled when dialed from the SIP phone.