It's been a long day so I'll keep this one short... Upgrading to Asterisk (libpri|zaptel) 1.4 solved my Cisco AS5350XM problem. However, now I've got a new one.
Zaptel 1.4 required a new version of Wanpipe. The new version of Wanpipe does not seem to work with mixed Ts. My T1 happens to have 12 DS0s for PRI and 12 for PPP.
I'm currently working with Sangoma to get this resolved so I can have it all!