Channelized T1's & Remote Access Routers

I've been handling routing for web farms for quite a while and all my clients have leased lines (T1's, T3's, etc) and haven't done much in the way of dialup connects except for a portmaster here and there for backdoor stuff. As a result, I'm a little dumb about basic dial-up access and equipment. What access router would I need to take in a channelized T1 that needs to have 6 of the lines split out for feeds to a fax server and the remaining used for dialup POPs? I've been looking at the Ascend/Lucent SuperPipe 155 and the Cisco 36xx and 53xx, but wonder if those can split out the fax server feeds I need from the T1. Any and all *constructive* feedback on this will be greatly appreciated. Karyn