1) Welcome to the Party!
2) As you are obviously new here, I have some suggestions to help us all help you:
When you post, please post your entire configuration including (but not limited to) your installation method and vicidial version with build.
This IS a requirement for posting along with reading the stickies (at the top of each forum) and the manager's manual (available on EFLO.net, both free and paid versions)
You should also post: 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. If your installation method is "from scratch" you must post your operating system and should also post the .iso version from which you installed your original operating system. If your installation is "Hosted" list the site name of the host.
If this is a "Cloud" or "Virtual" server, please note the technology involved along with the version of that techology (ie: VMware Server Version 2.0.2). If it is not, merely stating the Motherboard model # and CPU would be helpful.
Similar to This:
Vicibox X.X from .iso | Vicidial X.X.X-XXX Build XXXXXX-XXXX | Asterisk X.X.X | Single Server | No Digium/Sangoma Hardware | No Extra Software After Installation | Intel DG35EC | Core2Quad Q6600
3) Please note that "Goautodial" is just the Installer -> Vicidial is the actual software you are using. This question may be best asked in the Vicidial board instead of the "installer" board for Goautodial. The goautodial board is great for OS related questions and "wizard" questions (as the goautodial installer in later versions has some cool wizards to help you along ...), but it does not change the actual dialer functions or db functions.
Guessing that you would agree, I will move this question to the Support board for Vicidial.
4) You may get more direct responses if you specify a language (or two? three?) that requires your special characters.
5) Perhaps even post a few words in that language stating the same question ... so someone with experience in it could actually bump into it through google ... long shot, but possible!
6) Character encoding AND filtering are both involved. The code of vicidial can strip out a large number of special characters plus the storing to and retrieving from the DB all come into play. We've argued with this for a few clients, but never in Cyrillic (AFAIK).