Zoeller said Friday he could not divulge details of those conversations because of attorney-client privilege, but says he's been hearing extensively from both sides of the issue.
Zoeller represents state lawmakers and other state officials in court and often provides legal advice.
The General Assembly will take up a proposal next month to add Indiana's ban on gay marriage to the state constitution. If the measure passes the Legislature, it would head to voters in November.
Judges recently overturned gay marriage bans in New Mexico, Ohio and Utah. Supporters of the Indiana constitutional amendment say it's needed to block similar action here.