2811 router config dissection

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Whats the best way to get a better understadning of whats going on in
this configuration of a 2811. I am trying to dissect this
configuration so that I can understand what is in there and why.
Please guide me in a better direction. Ive included the config, took
some stuff out just to not share whats not mine but would greatly
appreciate any help. Even any references also.
Thanks in advance,

!
service timestamps debug datetime localtime
service timestamps log datetime localtime
no service password-encryption
!
hostname xxxxxxxxx
!
boot-start-marker
boot-end-marker
!
logging buffered 65536 debugging
enable secret 5 xxxxxxxxxxxxxxxxx
!
no aaa new-model
!
resource policy
!
clock timezone MST -7
clock summer-time MDT recurring
clock calendar-valid
no network-clock-participate wic 0
network-clock-participate aim 0
ip subnet-zero
!
!
ip cef
!
ip domain name xxxxxxxxxxxxxxx
!
no ip dhcp use vrf connected
ip dhcp excluded-address 10.101.20.1
ip dhcp excluded-address 10.101.20.1
!
ip dhcp pool VOIP
network 10.101.2.12 255.255.255.128
default-router 10.101.20.12
option 150 ip 10.2.1.5 10.2.1.6
!
ip dhcp pool DATA
network 10.101.2.0 255.255.255.128
default-router 10.10.2.1
dns-server 10.4.0.1 10.4.0.1
!
!
no ip domain lookup
!
voice-card 0
no dspfarm
!
!
controller T1 0/0/0
mode atm aim 0
framing esf
linecode b8zs
!
!
class-map match-all VOIP
match ip dscp ef
!
!
policy-map LLQ
class VOIP
priority 90
class class-default
fair-queue
!
!
!
!
interface FastEthernet0/0
description xxxxxxxxx fa 1/0/2
no ip address
duplex auto
speed auto
max-reserved-bandwidth 100
service-policy output LLQ
!
interface FastEthernet0/0.1
description DATA
encapsulation dot1Q 1 native
ip address 10.101.20.1 255.255.255.128
no snmp trap link-status
!
interface FastEthernet0/0.10
description VOIP
encapsulation dot1Q 10
ip address 10.101.20.1 255.255.255.128
no snmp trap link-status
!
interface FastEthernet0/1
no ip address
shutdown
duplex auto
speed auto
!
!
interface ATM0/0/0
description ATM Circuit 24.HCGJ.015522
no ip address
no scrambling-payload
no atm ilmi-keepalive
max-reserved-bandwidth 100
service-policy output LLQ
!
interface ATM0/0/0.36 point-to-point
description xxxxxxxxxxxxxx
ip address 10.100.10.1 255.255.255.252
pvc 1/36
ubr 1382
encapsulation aal5snap
!
!
!
ip classless
ip route 0.0.0.0 0.0.0.0 10.100.100.161
ip route 0.0.0.0 0.0.0.0 10.101.20.1
!
!
ip http server
no ip http secure-server
!
!
snmp-server community dwr RO
snmp-server community rwd RW
snmp-server enable traps tty
!
!
!
control-plane
!
!
banner login ^C*****Your contact number is:
^C
banner motd ^C*****Welcome!
*****This router is the property of  ;
*****Use of this network device is restricted to our network team;
*****Unauthorized access and/or use is prohibited!
^C
!
!
voice-port 0/1/0
timing hookflash-out 500
!
voice-port 0/1/1
timing hookflash-out 500
!
voice-port 0/1/2
timing hookflash-out 500
!
voice-port 0/1/3
timing hookflash-out 500
!
voice-port 0/2/0
!
voice-port 0/2/1
!
voice-port 0/2/2
!
voice-port 0/2/3
!
ccm-manager fallback-mgcp
ccm-manager redundant-host 10.2.1.5
ccm-manager mgcp
ccm-manager music-on-hold
ccm-manager config server 10.2.1.6
ccm-manager config
!
mgcp
mgcp call-agent 10.2.1.6 2427 service-type mgcp version 0.1
mgcp dtmf-relay voip codec all mode out-of-band
mgcp rtp unreachable timeout 1000 action notify
mgcp modem passthrough voip mode nse
mgcp package-capability rtp-package
no mgcp package-capability res-package
mgcp package-capability sst-package
no mgcp package-capability fxr-package
mgcp package-capability pre-package
no mgcp timer receive-rtcp
mgcp sdp simple
mgcp fax t38 inhibit
mgcp rtp payload-type g726r16 static
!
mgcp profile default
!
!
!
dial-peer voice 999010 pots
service mgcpapp
port 0/1/0
!
dial-peer voice 999011 pots
service mgcpapp
port 0/1/1
!
dial-peer voice 999012 pots
service mgcpapp
port 0/1/2
!
dial-peer voice 999013 pots
service mgcpapp
port 0/1/3
!
!
!
call-manager-fallback
max-conferences 8 gain -6
!
!
line con 0
password dnr
logging synchronous
login
line aux 0
password dnr
logging synchronous
login
line vty 0 4
password dnr
logging synchronous
login
transport input telnet
!
scheduler allocate 20000 1000
ntp update-calendar
!
!



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