Does voice chat on the internet invalidate the fast?
All perfect praise be to Allaah, the Lord of the Worlds. I testify that there is none worthy of worship except Allaah, and that Muhammad, sallallaahu ‘alayhi wa sallam, is His Slave and Messenger.
In principle, mere voice chat on the internet does not invalidate the fast. However, if chatting between the two sexes arouses sexual desire and causes a discharge of semen (or vaginal fluid), then it invalidates the fast. The majority of the Maaliki scholars are of the opinion that discharge of the pre-seminal fluid also invalidates the fast, but the majority of the scholars have disagreed with them on this point. Shaykhul-Islam considered the opinion of the majority of scholars the preponderant one.
Finally, you should know that erotic speech between any woman and a non-Mahram (non marriageable) man is prohibited, and far more prohibited while fasting.
Allaah Knows best.
You can search for fatwa through many choices