Hello Scott,
Your guide was easy and fast, thanks tor that! But unfortunately i was having an error in the last part of the installation... Im not sure if this is because the CentOS available on the VPS its 6.5...and you recommend just 6...
The error is the next:

unixODBC.x86_64 0:2.2.14-14.el6
urw-fonts.noarch 0:2.4-10.el6
vsftpd.x86_64 0:2.2.2-14.el6
wanpipe-util.x86_64 0:7.0.10-2
wavpack.x86_64 0:4.60-1.1.el6
xinetd.x86_64 2:2.3.14-39.el6_4
xorg-x11-font-utils.x86_64 1:7.2-11.el6

Failed:
elastix-framework.noarch 0:3.0.0-11

Complete!

And then in the web console, the system ask me about the SQL Password, I configured that and then ask me about the root login over CentOS... until there nothing so abnormal.. but nothing more happened...

(params 0)
0(3589) : <core> [cfg.y:3412]: yyerror_at(): parse error in config file //etc/kamailio/kamailio.cfg, li
ne 1275, column 41: unknown command, missing loadmodule?

ERROR: bad config file (5 errors)

SETTING FILE PERMISSIONS Asterisk
Permissions Asterisk OK
Starting asterisk: [ OK ]
Starting crond: [ OK ]
Starting Elastix Port Knocking: Error: no such table: portknock_eth
[ OK ]
Starting fail2ban: [ OK ]
Starting HylaFAX queue manager (faxq): [ OK ]
Starting HylaFAX server (hfaxd): [ OK ]
Starting IAXmodem: [ OK ]

CentOS release 6.7 (Final)
Kernel 4.4.0-x86_64-linode63 on an x86_64

38-85.members.linode.com login: root
Password:
Last login: Mon Feb 8 20:04:37 on ttyS0
[root@38-85 ~]#

I really appreciate your help... i can not find a lot of information about this Elastix MT version.
Regards!

@nick For CallCenter... I don't recommend to use Elastix 4 or MT, that kind of platform is thinking to admin a lot of companies from the same server, but in the case of CallCenter I recommend you to use 2.5, is a more fiable in my opinion i don't know what think scott about it...

Remember that the version 4 o MT its about Multi Tennant but is not the upgrade for 2.5 it going in different way...

@scottalanmiller Thanks a lot! its working fine, but its posible that somthing is wrong? I cant log in any endpoint... maybe I am... but this endpoint it was looged to another elastix, i just create the same number user and pas... and i only change the ip on it... but say timeout error...