VICIdial DTMF Troubleshooting

Originally published at vicistack.com . Follow us for more call center engineering content. Last updated: March 2026 | Reading time: ~24 minutes DTMF problems in VICIdial are the kind of issue that makes you question your career choices. The agent presses a button to transfer a call. Nothing happens. They press it again. Still nothing. The customer is sitting there listening to silence while your agent frantically clicks a button that used to work fine yesterday. Or maybe it's your IVR. Callers dial in, hear "Press 1 for sales," and press 1. Your Call Menu doesn't register the digit. They press it again. And again. Then they hang up. You just lost a lead because of a DTMF configuration mismatch that takes 30 seconds to fix once you know what's wrong. I've been troubleshooting DTMF issues in Asterisk-based systems since 2012. The problem is almost always one of five things, and I'm going to walk through every single one of them with the exact configs you need. What DTMF Is (30-Second Ve