To use Azure AI agents in SIP Caller, you need an API Key and an Endpoint from Microsoft Azure AI Foundry. Follow the steps below to obtain them.
Go to Azure AI Foundry and create a new project. Fill in the following fields:

Once the project has been created, you will find the API key and the Project endpoint on the project overview page.

API Key: copy the API key and paste it into the API Key field in SIP Caller.
Endpoint: the Project endpoint shown in Azure AI Foundry follows this format:
https://sipcaller-ai-agents-resource.services.ai.azure.com/api/projects/sipcaller-ai-agents
The value to enter in SIP Caller is only the first part — up to and not including /api/projects/...:
https://sipcaller-ai-agents-resource.services.ai.azure.com