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Learning Linux, book recommendation

I've been working with various microsoft so and server platforms, but have never touched linux. Basically I'm '0' on linux. Now I like to build my own PBX with Asterisk, it seems as the time to learn Linux arrived finally to my front.
What is the best single book cover all 3 phases (beginner, intermediate, professional) recommended? I guess there's such single book to live with it from A-Z so that I don't have to jump around different books to study for a while.

Also, there are many different version of Linux os. What is most popular, good and bad for each? For example, for server applications to run such as DHCP, DNS, mail server, database, are there any specialized version of linux to choose? Debian and Red Hat seems to be popular in enterprise and small business environment...

Asterisk seems working fine with Fedora and CentOS

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Seth Simmons

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Imtiaz Hasham

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Zerox Hoop

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crcsupport

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ihasham,
is 3cx server takes T1 PRI, then on client sidec, I can operate via voip phones?

Imtiaz Hasham

The 3CX Server will not take any PRI and you need a gateway for ISDN / PSTN lines etc.

So this is what you have:

ISDN Lines --- Gateway -------- The
VOIP Lines -------------------------- 3CX ------- IP Phones
PSTN Lines --- Gateway -------- Server --- Gateway --- PSTN Phones

Imtiaz Hasham

Always imagine 3CX as a middleman! - For that matter, any PBX.

I would be happy to give you a run through over the phone / Skype, if you prefer!