I would concentrate my efforts more towards the Telephone system than the cabling side. As I have a cabling crew and take care of a fairly large PBX, I would say the PBX is a lot more complicated than the cabling side. Not taking anything away from the cabling side here guys, as one is as important as the other.
Even more so now with POE, and VoIP.
I would look towards the vendors website for training or find the system here on TT and read, read, and read some more. While the installation practices will slightly vary from one category cabling to the next, the PBX side is changing daily. The traditional processors are now gone and the move towards VoIP is running ramped. All the processors are now servers, which in itself is a major challenge to say the least. Now their are firmware, software and hardware changes all the time.
If you will post your system type I will try to help. And for more about cabling. Well you are already at the best place to learn about that. Read through the different post here on TT cabling and learn. These guys here are willing and happy to teach..
Hell, there are no rules here - we're trying to accomplish something.
Thomas A. Edison
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