Hello @davidregalado25 ,Welcome on Google Cloud Community.
No, it's not possible to directly call a Virtual Machine (VM) using an internal IP from Dialogflow. Dialogflow is primarily a conversational interface platform used to build chatbots and virtual agents, and it doesn't have native capabilities to interact with infrastructure components like VMs directly using internal IPs.
However, AFAIR Dialogflow, you can configure a [1].webhook that sends requests to your API gateway. The webhook can be triggered during a Dialogflow session based on specific intents or actions.
[1]. https://cloud.google.com/dialogflow/cx/docs/concept/webhook
cheers,
DamianS
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