To access the call ID during a call using the Vapi Web SDK, you will typically find it in your call object once the call is initiated. It's essential to ensure that you are implementing your event listeners correctly to capture the call initiation event, where the call ID is usually available.
If you haven't done so already, you might want to review the specific sections on setting up event listeners in the [Vapi Phone Calling documentation](
https://docs.vapi.ai/phone-calling). This documentation provides crucial information regarding handling outbound and inbound calls, which should assist in capturing the required call details, including the call ID..