What is better IAX trunk or remote agents

Situation:
working Asterisk Version 1.4 with an European T1 (30 Lines)
running Vicidialnow 1.2 latest release
i have tried multi server with loadbalancing, it was working fine but it was asterisk 1.2 + vicidianow 1.2
so does this work with asterisk 1.4 too?
working Asterisk Version 1.4 with an European T1 (30 Lines)
running Vicidialnow 1.2 latest release
i have tried multi server with loadbalancing, it was working fine but it was asterisk 1.2 + vicidianow 1.2
so does this work with asterisk 1.4 too?