Thanks. So here is my VICaR setting: Basic: International Call Routing: Enabled Calling Card Number: my GV number Country Codes to Exclude: +1 Advanced: Format required for DTMF tone: 011<Country Code><Area Code><Phone Number> Prefix before DTMF tone: 1234p2p Suffix after DTMF tone: (blank) When I dial an international number, it did call the google voice number. But after that, I can hear the GV talking to me, asking me to enter my PIN etc. But my phone didn't do anything. Anything I did wrong? Thanks!