Need help with compensation discussion rounds?

Hi all,

Fresher here, recently got interviews cleared for a company X. I've had one round of comp discussion on call and I'm pretty sure they're lowballing me.

Any tips on how I can turn the discussion to my benefit and what all things I should be asking about?

PS. I'm currently employed with 1 month experience, with a fixed pay of 6 and variable of 0.5.