2811 router config dissection

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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