I dont think this is possible with PRI circuit but if you have CAS circuit I believe you can configure in following manner and have single ds0 picked out from a full T1. Please check the example attaced below. In the case below I have ds0 13 singled out from 2 T1's and both ds0 is assigned a single trunk group ID cisco#1
Hope that helps..
Regards,
ketan
!
controller T1 2/2
framing esf
linecode b8zs
ds0-group 0 timeslots 1-12 type e&m-fgb
ds0-group 1 timeslots 13 type e&m-fgb
ds0-group 2 timeslots 14-24 type e&m-fgd
cas-custom 0
trunk-group MCI
cas-custom 1
trunk-group cisco#1
cas-custom 2
trunk-group AT&T
!
controller T1 2/3
shutdown
framing esf
linecode ami
ds0-group 0 timeslots 1-12 type e&m-fgb
ds0-group 1 timeslots 13 type e&m-fgb
ds0-group 2 timeslots 14-24 type e&m-fgd
cas-custom 0
trunk-group MCI
cas-custom 1
trunk-group cisco#1
cas-custom 2
trunk-group AT&T
!