title: SIP library for watchOS 5 development kit
body: <p>In my case, I need to make an in-house communication system using Apple watches ( watch to watch, using WiFi only).
  There I'm planning to use SIP protocol for voice communication</p>
  
  <p>*And already found the SIP Library <a href="https://github.com/cwliu/linphone-swift-demo" rel="nofollow noreferrer">linphone-swift-demo</a> And it is not supported the WatchOS</p>