vicidial version and build, asterisk version, telephony hardware (model number is helpful here), cluster information if you have one, and whether any other software is installed in the box.
you may need to set up a sip trunk and see if the results are different so you can compare where they are "different" and perhaps make some adjustments to make them less different.
on the other hand, it may turn out not to be related to the h323 trunk (which is why a sip test is handy). in which case it will depend on your version of vici (you may want to consider upgrading to the latest SVN version of vicidial to see if that resolves your issue, and you may want to consider the OpenSUSE version if that doesn't help ... then get down to in-depth troubleshooting if none of that helps)
also i note you have h.323 running, we have another contestant who is interested in getting that going on another forum thread here:
http://www.vicidial.org/VICIDIALforum/v ... 2680#52680 you could drop him a line and let him know how your other system is working in vicidial if it's also h323, he's quite interested.