
Oct 17, 2017 I have to set the default telephone app on 10 iMacs and don't want to register 10 iCloud-accounts just to do the facetime login and being able to open the preferences there. That's ridiculous. Installed RCDefaultApp and set the default telephone app there but the phone-icon in contacts application is still greyed-out. Download the OnSIP desktop app for Windows, Mac or Linux. A Business Phone for Modern Teams. Version 3.9.3.

About the App
- App name: sip
- App description: Tool to create Python bindings for C and C++ libraries
- App website: http://www.riverbankcomputing.co.uk/software/sip

Sip Phone App For Mac Pc
Install the App
Mac Sip Phone
- Press
Command+Spaceand type Terminal and press enter/return key. - Run in Terminal app:
ruby -e '$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)' < /dev/null 2> /dev/null
and press enter/return key.
If the screen prompts you to enter a password, please enter your Mac's user password to continue. When you type the password, it won't be displayed on screen, but the system would accept it. So just type your password and press ENTER/RETURN key. Then wait for the command to finish. - Run:
brew install sip
Done! You can now use sip.