asterisk users - Jun 2010 - Use one ring-group for ISN truncs

Hi,

A question.
We are using TE420 cards.
Normally we configure for each truncs one ring-group.
group=1
channel => 1-15,17-31
group=2
channel => 32-46,48-62
group=3
channel => 63-77,79-93
group=4
channel => 94-108,110-124

My question now, is it possible to join more ring-groups to one ring-group?
Example:
Group 1
channel => 1-15,17-31
channel => 32-46,48-62
group=2
channel => 63-77,79-93
channel => 94-108,110-124

Regards,

Arjan Kroon
Mobillion BV