Selintra
The reason why you had difficulty finding the packages is that Zaptel has been renamed DAHDI.
So the packages are now zaptel > dahdi-linux and zaptel-kmdl > dahdi-linux-kmdl.
If you update the wiki install instructions then we can go back to use atrpms.
UPDATE: It appears this is not entirely correct; the Zaptel kmdl requires kernel 2.6.9-78.0.13, whereas SME 7.4 only has -78.0.8.