From the FAQ: http://superuser.com/faq
Super User is for computer enthusiasts and power users. If you have a question about …
- computer hardware computer
- software personal and home
- computer networking
and it is not about …
- videogames or consoles
- websites or web services like Facebook, Twitter, and WordPress
- electronic devices, media players, cell phones or smart phones, except insofar as they interface with your computer
- issues specific to corporate IT support and networks
- a shopping or buying recommendation
The exception for cell phones and smart phones, "except insofar as they interface with your computer", does not apply here, as TCP/IP communication (and VoIP) on these phones happen without the interaction of a computer.