Fixed some bugs and updated SIP.js version.
- Fixed case where app would crash when deleting a favorite contact
- Resolved navigation issue when transferring or creating a new call
- Addressed edge case in which the app would ring nonstop even with no incoming calls
- Android only: Fixed issue where notifications failed to show
- Android only: Fixed potential edge case in which mobile calls were received after logging out of the app
- iOS only: Fixed a case where the app would crash upon accepting a call
- Updated SIP.js to version 0.15.7