Please update it to 1.4.21 at the very least (I think 1.4.21.2 is latest currently). If you go to a version above 1.4.22 you will then need to change from using Zap drivers to Dadhi drivers due to asterisk changing this for legal reasons.
and where in the initial post did you make that statement?
I don’t mean to be a jerk here but, if you have a specific requirement like that you need to be very up front and state them or you are bound to get instructions for things that are counter productive to what you want and have not stated. Yes you mentioned that you have VGSM-II card but you did NOT say you were locked to that version because of it.
Please remember we can’t see your setup, we don’t know anything about it, and we can’t know your goals and motives if you don’t state them.
At this point I don’t know what to tell you as there were several reporting bugs in the early versions of asterisk 1.4 and the way to fix them is to upgrade to a more current version.
I would not install 1.4.24, there are known bugs that break things like confirmation on followme and ringgroups, and a few other things. At this point I would not go past 1.4.22.