Simple and does the job

We use this inside our office LAN to connect to our VOIP phone system. The UI is barely there. You just type the numbers using your keyboard and it does the right thing. Sound quality is pretty good, too.

I don’t understand whtat Crash1977 says about any proxy. There are none it uses by default — it connects directly to our server which has no public visibility.

Vick Khera about Telephone