Aleksander,
Let me attempt to answer your questions.
- International dial plan
Country Dial plans: Yes. We have a default un-editable dial plan for every country. When you choose the country in the Region settings the correct dial plan should be populated.
For internation dialing: Yes. We have international dialing for every country. Let me know if you are not able to make international calls. Let me know which country and what you dialed ( Eg. Prefix for North America is 011).
- Variable length dial plan
Currently the default dial plan is not editable.
- Custom associations of dial route patterns with multiple trunks
Feature not available. The only way to control what goes through which trunk is through steering digits.