SIP VoIP Phone
Linphone is an open-source SIP phone service with free registration and call fees. It supports mobile and desktop environments, including iOS, Android, Windows Phone 8, GNU/Linux, Windows Desktop, and MAC OSX. By setting up automation conditions, it can call a mobile phone to alert you of abnormalities when events occur (such as when a specified sensor outputs). Usually, it can be used as a regular phone, and subscribers to Linphone's service or users with publicly available SIP addresses can have conversations using a 050 number.
You can operate the device via a web interface or an IR remote control. Through the web interface, you can call multiple registered users or any SIP address. You can call your home gateway directly from your mobile phone while you are away from home to check the status of an empty room or make a one-way call.
Operation Display for Linphone