[Asterisk-Users] Zaptel card AND Ztdummy together?

[Rod Bacon]

I had a weird (unforeseen) situation today. We have a remote office with an * server and ISDN 10 service. We connect to each other over an IAX trunk 
with G729.

Today, some of Sydney experienced a power surge which knocked out their ISDN services. Without a clock source on their PRI card, my IAX calls to them 
resulted in one-way audio (they could hear me, but I not them).

Is it possible to load *both* the relevant card driver *and* ztdummy to guard against this occurrance?