You can use Plivo endpoint in SIP phone to make calls and receive calls, for example, you can use softphones like Xlite, Zoiper, etc. And you can also use our webSDK, Android SDK, iOS SDK to make calls and receive calls,
Steps to configure SIP endpoint in SIP phone:
To create a SIP endpoint: https://manage.plivo.com/endpoint/create/
To add the direct dial app so as to make calls and receive calls: https://manage.plivo.com/app/create/ and add the answer_URL of the application as http://plivodirectdial.herokuapp.com/response/sip/route/?DialMusic=real&CLID= PUT YOUR CALLER ID HERE.
Ensure that you replace the caller ID with your desired phone number.
Assign the application to the SIP endpoint created.
Then follow the instructions for Xlite or Zoiper or use our SDK to make calls and receive calls.