I'm looking for a good voice over ip program to make phone calls using Ubuntu. Can you help me?

I only need the basic functionality i.e. voice (sound, audio) and not everything else. I don't require profiles, chat, account management, business vs personal accounts or so.

I only want a good basic functionality that also has good availability.

My geographic location is northern Europe (Stockholm), if that matters. I could be satisfied even with local calls only within Stockholm since that is my common case.

My preferences are, in descending order:

Low price or free of charge, quality of sound, lag, user-friendliness, community.

Price is the most important in this case since otherwise I might just use my regular cellphone.

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    We will need much more information to give good recommendations here. Please take a look at What is required for a question to contain "enough information"? Then please edit your question and see if you can incorporate some of these improvements. What features do you need (e.g. voice calls, video calls, chat, registering the tel:// protocoll so you can even click corresponding URLs in the browser to initialte calls…)? Some VoIP supporting software even comes pre-installed on most sytems (Ekiga, Pidgin). – Izzy Feb 28 '17 at 7:52
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    There are many VOIP tools for Ubuntu. Please sort these in your order of priority: Quality of sound, lag, user-friendliness, community, price. Also, do you need group calls? Please edit your question then ask us to reopen. – Nicolas Raoul Mar 1 '17 at 5:13
  • @NicolasRaoul I only need a good basic function and I can even be happy with local calls only. Naturally I mean the common case. My common case is a local phonecall with voice only and only between me and exactly one other phone number. I want the program to be able to call a number that is not registered with the VOIP provider. Example: From the program I should be able to call +46 (0) 8 753 25 xx where that number is not even connected to the VOIP provider. I want this as simple as making a local normal phone call from my computer. – Niklas Mar 5 '17 at 7:42
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    Please edit your question and write these in your order of priority: Quality of sound, lag, user-friendliness, community, price. – Nicolas Raoul Mar 6 '17 at 2:08

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