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services.talk.direct_media was an expression in meta/services.yml that read ansible_facts['all_ipv4_addresses'] and nested config lookups. lookup('config') renders it where the applications are merged without host facts; the render fails there, the lookup hands back the raw expression and `| bool` coerces it to False with a deprecation warning. Direct media therefore never switched on: both the first requirement-061 deploy and CI run 40877408319 logged the coercion, and a render in the development container returned the raw string without facts and true with them.
meta/services.yml keeps only the inventory switch, now `direct_media: false`, so every Talk stream goes through web-svc-coturn unless an operator opts a host in. That is the behaviour the bug produced everywhere, so no host changes on deploy, and it keeps Janus off the public network by default. vars/main.yml decides in task context from the switch, Talk, standalone TURN, the bridged network, compose mode and NEXTCLOUD_HPB_HOST_ADDRESSES, which reads the facts the way web-svc-coturn does. The flag tests render that chain against the merged applications: off by default, on for an opted-in compose host with coturn and an owned address, off for host networking, a foreign or loopback address, swarm, onboard TURN and missing facts. Administration.md documents the opt-in.
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>