Obviously you must first get an error free T1 connection to the G3 switch in order to get an accurate test.
Some of the things you have in your config are correct, some need to change.
First, you have to use type ext-sig for all the ds0-groups. Also, you must define a separate ds0-group for each channel to be used -- both bearers and signaling. And you must use connection trunk on both the bearer and signaling voice-ports, not just the signaling ones. You had the right idea to use a normal codec for the bearer voip dial-peers and clear channel codec fo rthe signaling dial-peers. Here is how I would set up the config for the router you did above (copy/pasted appropriate parts then modified, only including what is relevant to this config). Hopefully this is clear to you.
It looks like you are still trying to achieve call routing decisions on the router but with DCS on the G3 switches and T-CCS feature on the routers, all the destination-patterns are dummy and only significant to setup the trunk connections between all the timeslots on each side of the data network and to make sure that timeslot 13 on side A is trunked to timeslot 13 on side B, etc.
controller T1 1/1
framing esf
clock source line primary
linecode b8zs
ds0-group 0 timeslots 23 type ext-sig ! DCS
ds0-group 1 timeslots 24 type ext-sig ! DCS
ds0-group 2 timeslots 13 type ext-sig ! bearer
ds0-group 3 timeslots 14 type ext-sig ! bearer
.
.
ds0-group 10 timeslots 21 type ext-sig ! bearer
ds0-group 11 timeslots 22 type ext-sig ! bearer
!
!
interface FastEthernet0/0
ip address x.x.x.x
!
voice-port 1/1:0
connection trunk 301 answer-mode
description DCS 1: we are 401, remote is 301
!
voice-port 1/1:1
connection trunk 302 answer-mode
description DCS 2: we are 402, remote is 302
!
voice-port 1/1:2
connection trunk 101 answer-mode
description bearer timeslot 13: we are 201, remote is 101
!
voice-port 1/1:3
connection trunk 102 answer-mode
!
voice-port 1/1:4
connection trunk 103 answer-mode
!
voice-port 1/1:5
connection trunk 104 answer-mode
.
.
voice-port 1/1:11
connection trunk 110 answer-mode
!
!
dial-peer voice 300 voip
destination-pattern 3.. ! this is for DCS channels
session target ipv4:y.y.y.y
codec clear-channel
!
dial-peer voice 100 voip
destination-pattern 1.. ! this is for bearers
session target ipv4:y.y.y.y
!
dial-peer voice 401 pots
destination-pattern 401 ! our DCS 1
port 1/1:0
!
dial-peer voice 402 pots
destination-pattern 402 ! our DCS 2
port 1/1:1
!
dial-peer voice 201 pots
destination-pattern 201 ! our bearer timeslot 13
port 1/1:2
!
dial-peer voice 202 pots
destination-pattern 202 ! our bearer timeslot 14
port 1/1:3
.
.
dial-peer voice 210 pots
destination-pattern 210 ! our bearer timeslot 22
port 1/1:11
