Lab equipment assistance

Dr_Atomic

I think what would help me in wrapping my brain around all the equipment needs for a voice lab would be knowing something like:

What would be suitable lab gear for a GW? [Example]

What would be suitable lab gear for a GK?

What would be suitable lab gear for a CallManager server?

What would be suitable lab gear for a PSTN cloud?

What would be suitable lab gear for an HQ? A SIP server?

Etc, etc. A voice lab requires such an array of different equipment that it would be good for me to be able to separate it all in my head. If someone could offer some suggestions, I'm going to print it out and go over it - maybe see about getting some of it (if I can afford it).