Howto: Asterisk 1.4.21 connection to VoIP Provider under Debian

Prerequisites:
Lots of caffeine
Long finger nails (they will be short by the end)
Needing a hair cut (might be bald by the end)

Note: I am just joking about the prerequisites, I found it hard to get stuff right cause a lot of howtos out there are bit vague and cryptic. So here is my attempt to make it a bit easier for others to setup Asterisk and connect to a VoIP provider.

What is Asterisk:

Asterisk is software that turns an ordinary computer into a voice communications server. Asterisk is the world’s most powerful and popular telephony development tool-kit. It is used by small businesses, large businesses, call centers, carriers and governments worldwide. Asterisk is open source and is available free to all under the terms of the GPL.

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