To use Gemini AI agents in SIP Caller, you need an API Key from Google AI Studio. Follow the steps below to obtain it.
Go to Google AI Studio and click on Dashboard.

Click on API keys in the left menu, then click Create API key.

Enter a name for the API key (for example, SIP Caller AI Agents), select a project, and confirm the creation. The API key will be displayed — copy it and paste it into the API Key field in SIP Caller.