Warm transfer demo

[kompfner]

Plan:

• First get this demo working without dial-in/dial-out. Just rely on the "customer" and the "agent" joining the Daily room directly in their browser.
• Then implement dial-in/dial-out—maybe in another demo? The complication is that getting dial-in/dial-out set up is pretty nontrivial for the user.

[vercel]

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Name	Status	Preview	Updated (UTC)
pipecat-flows	✅ Ready (Inspect)	Visit Preview	Apr 2, 2025 4:50pm

[kompfner]

Note to self: do not rebase warm-transfer-demo on top of function-action-type until the issue with the latest commit of function-action-type is fixed. Rebasing will cause the demo to stop working.

[markbackman]

This is really great! While the logic is complex, it's relatively easy to follow along. (I wonder if we should think about adding conveniences to make controlling remote participants easier, especially for a customer/agent/bot scenario. That's for another PR though.)

I've noticed that sometimes the canReceive() change works and other times it doesn't. Not sure if this is relevant, but I see the following errors when the command runs:

{"timestamp":"2025-03-27T15:00:45.513169Z","level":"ERROR","fields":{"message":"no subscription for consumer: ConsumerId(\"0daee4f5-5d5d-41cb-81e6-9bbb55c5d8e7\")"},"target":"daily_core::call_manager::events::from_sfu::soup_consumer_closed"}
{"timestamp":"2025-03-27T15:00:45.562691Z","level":"ERROR","fields":{"message":"Failed to close consumer: ConsumerNoLongerExists(ConsumerId(\"0daee4f5-5d5d-41cb-81e6-9bbb55c5d8e7\"))"},"target":"daily_core::call_manager::events::subscription::common"}

I'm running Pipecat 0.0.61 and Flows 0.0.16.

One minor UX improvement might be to print the agent URL when it's time for the agent to join, rather than at the start of the session.

Other that, this is really on the right track. Very impressive! 👏

[markbackman]

Do we want the hold_music folder to be within an assets directory within examples? Maybe examples/assets? Rationale being that it isn't a demo in itself. It's an asset used by a Flows demo.

[kompfner]

Good idea!

[markbackman]

LGTM! 🎉

Just one question about where the hold_music should reside.