Live View Problem (Repost?)
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# Bug Report

### Describe the Bug
Using a Ring Doorbell Pro and a Ring Spotlight Cam. Brought both via your HOOBS plugin to HomeKit, both show a Preview Picture. Ring Doorbell allows a Live View. Spotlight Cam Picture shows "No Response" when I try to open Live View. After closing the Live View the Preview Picture also shows "No Response" and no picture anymore. 

### To Reproduce
Steps to reproduce the behavior:
 - Place Ring Spotlight Cam in iOS Home Application
 - Try to open Live View for Spotlight Cam
 - Error "No Response"

### Expected behavior
<!-- ✍️edit: --> Should open Live View like it does with Ring Doorbell Pro.


### Screenshots/Logs
<!-- ✍️edit: --> 
Start:
![IMG_1991](https://user-images.githubusercontent.com/8375773/92089426-6f070b80-edce-11ea-90d4-f512222ea7b7.png)
Click on Terrasse for Live View:
![IMG_1992](https://user-images.githubusercontent.com/8375773/92089482-7e865480-edce-11ea-9c62-63aa774334f2.png)
Back to Startpage / Close Live View:
![IMG_1993](https://user-images.githubusercontent.com/8375773/92089502-8514cc00-edce-11ea-869a-6ba67f49e695.png)


```
3.9.2020, 10:02:13 [Ring] Preparing Live Stream for Terrasse
3.9.2020, 10:02:14 [Ring] Failed to parse SDP from Ring
3.9.2020, 10:02:14 [Ring] v=0
o=Wantajobinstead? 1529310922 1529310923 IN IP4 
s=Wantajobinstead?
c=IN IP4 34.247.24.72
t=0 0

m=audio 28428 RTP/SAVPF 0
a=rtpmap:0 PCMU/8000
a=rtcp:42359 IN IP4 34.247.24.72
a=crypto:1 AES_CM_128_HMAC_SHA1_80 inline:r9Zj9UGLvGcdOJK70NorzzYVnF0LYOLuu0wY9AUy
a=ptime:20

m=video 47254 RTP/SAVPF 99
a=rtpmap:99 H264/90000
a=fmtp:99 profile-level-id=42000a
a=rtcp:54732 IN IP4 34.247.24.72
a=rtcp-fb:99 nack
a=crypto:1 AES_CM_128_HMAC_SHA1_80 inline:/x3qxBKfRx9qZdeGBkWB8DiaUjXIesNYEbeo19rj
3.9.2020, 10:02:14 [Ring] Failed to prepare stream for Terrasse (0.791s)
3.9.2020, 10:02:14 [Ring] TypeError: Cannot read property 'match' of undefined
    at getRtpDescription (/home/hoobs/.hoobs/node_modules/homebridge-ring/lib/api/sip-call.js:24:54)
    at parseRtpDescription (/home/hoobs/.hoobs/node_modules/homebridge-ring/lib/api/sip-call.js:36:16)
    at SipCall.<anonymous> (/home/hoobs/.hoobs/node_modules/homebridge-ring/lib/api/sip-call.js:204:20)
    at Generator.next (<anonymous>)
    at fulfilled (/home/hoobs/.hoobs/node_modules/homebridge-ring/lib/api/sip-call.js:5:58)
    at runMicrotasks (<anonymous>)
    at processTicksAndRejections (internal/process/task_queues.js:97:5)

```


### Additional context
<!-- ✍️edit: --> Doorbell works perfectly in the same environment. I already went through the trouble shooting document for cameras without success.

### Environment
<!-- ✍️edit: -->
 - OS: Raspberry Pi 2, Hoobs Image downloaded yesterday from official source
 - Node.js: v12.16.3
 - NPM: 6.14.4
 - ring-client-api: 9.9.0
