asterisk users - Aug 2006 - Non-zaptel hardware based timing sources

What would the recommended timing source be other than zaptel cards for 
Asterisk svn trunk on Linux 2.6.x?

I have a server that was running with 2 te410p's. I've converted to
using
SIP so I don't need the cards anymore -- other than to provide a timing 
source for our applications -- mostly meetme conferencing.

What have you had good experiences with? ztdummy? zaprtc? ???

Would I be better off leaving one of the t1 cards in? What about an xp101?

Thanks in advance,
------------------------------------------------------------------------
Steve Edwards      sedwards@sedwards.com      Voice: +1-760-468-3867 PST
Newline                                             Fax: +1-760-731-3000