Hello team! I'd like some advice on setting up a VAPI SIPTHRUNK number. I've connected a local number to VAPI via SIPTHRUNK. Here's how to set it up: 1. Specify a SIP endpoint with your SIP provider and forward incoming calls to VAPI. 2. Add VAPI's IP address to your whitelist. Are there any other settings I need to make? After setting these up, can I make and receive calls with VAPI? I'm new to VAPI, so please let me know.