>>Also there should be a way to switch off this list of popular carriers, because they may be inapplicable for a particular area in the world.no, I mean removing the whole list completely. If your software is installed in Europe, and the list of carriers contains only US carriers, it will simply be annoying to choose "other" every time.
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>Yes, you'll be able to choose "other..."
Even in small Switzerland, there are a dozen of popular SIP providers, and few dozens of less popular ones :)
so, any ready-made list would be useless.