asterisk users - Feb 2004 - Mediatrix 1204 FXO GW ring cadence question

I'm still in a test mode with a new Mediatrix 1204 fxo gateway, and been
having an issue with the 1204 properly detecting callerid.

Two pstn lines installed, both with callerid.
One pstn line rings with a standard US ring (long ring)
Second pstn line is a CO Centrex and rings with a long+short ring

It appears the 1204 senses and "sets" the ring cadence used for the CO
centrex line (long + short ring), and looks for the callerid after that
second ring. It then apparently uses that setting for all four lines, as
the first pstn line (long ring) never accepts the callerid once the
CO centrex line has rung. (After a reboot, the 1204 properly detects the
callerid. But, after the CO centrex rings, it never detects callerid on
the normal pstn line again.)

Have any of you 1204 users bumped into that before?

Any work arounds?

Rich