As you can see from DeadPool's stickied thread on PM codes:
Quote:
Originally Posted by DEADP00L
/chgmap (map_id) (x) (y)
change map & teleport to x,y on the map
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You can't really make a definite list of codes since each map would have hundreds of x,y positions you can teleport to.
If you are interested in a list of maps and their ids a member recently posted a thread of them (ignore the name of the thread. Its for maps)

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All the original teleporters all run from different cq_action lines. However you can code your own NPC and replace all the others as many servers do. Then you can just add as many pages as you need for the amount of maps you want to teleport too. funhacker even made a tool to help out with map teleporter coding:

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