createSipSession - Listen for RTP from it?
Hey guys, great job on the api! I have a question regarding createSipSession (Forgive my ignorance on what is actually going on) and how it works.

What I would like to do is essentially get the live feed by creating a sip call and initiating RTP then listen to the RTP outside of the API. For example, I would like to stream the udp (is it using udp?) packets in python's CV2 library for some real time manipulation of the stream. Is this possible?  

I'm just throwing alot of things at the api and hoping they stick. Again, sorry if I completely have things upside down. Below is an example of where I'm going with this.

```   
doorbell.onNewDing.subscribe((newDingOrMotion) => {
        const sipSession = doorbell.createSipSession();
        .then((session) => {
            console.log(session);
            return session.start();
        })
        .then((start) => {
            console.log(start);
            console.log('Stream going to', `udp://${start.address}:${start.video.port}`);
        });
    });
````

Based on the information from createSipSession, can I see where the data stream is going so I could get the udp stream within python? 

```
cap = cv2.VideoCapture('udp://3.251.100.100:35662',cv2.CAP_FFMPEG)
if not cap.isOpened():
    print('VideoCapture not opened')
    exit(-1)

while True:
    ret, frame = cap.read()
    if not ret:
        print('frame empty')
        break

    cv2.imshow('image', frame)

    if cv2.waitKey(1)&0XFF == ord('q'):
        break

cap.release()
cv2.destroyAllWindows()
```

Any information that might help me is greatly appreciated! Thanks