asterisk users - Sep 2005 - Setting up multiple trunk groups with different internal ring groups

Hi,
 
I have 4 analogue PSTN lines on my legacy PBX, 2 lines on one number in a
rollover group ZAP1 & ZAP2 and 2 lines on another number ZAP3 & ZAP4. 
Is it possible to have a group of phones ring when lines ZAP1 & 2 are called
and a DIFFERENT set of extensions ring when ZAP3 or ZAP4 receive a caller?
Any suggestions would be appreciated, or perhaps point me to the correct
documentation. Im a newbie to Asterisk and have found finding documentation
tricky.
 
Thanks
 
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