In case anyone is interested, loading Ztdummy AND a card driver at the same 
time will result in unpredictable timing issues.

We heard intermittent echo/feedback on PRI channels.


Rod Bacon wrote:
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?
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