AddEffectVoice issue

[KiraImmortal]

as i'm making pretty good progress with my AMFP fc mod, i've ran into another (guess small) problem. another post that was also made by me had a question about cache files, i now understand what they are (mostly), still the phone calls in the game are still not working. i looked at the script and there is nothing there. picking up the phone, and then a timer which shows when the phone call will end.. nothing! but as i have some experience with amnesia editing, i know that the AddEffectVoice method can give us the desired effect. i used it in my mod also, there is one thing which i don't know about it.

Using the AddEffectVoice command, how can i time a dialog which is in one file (two people talking to each other, but the whole thing is in one .ogg file), how the subtitles will appear properly?