Step A -- minimal-viable T5 surface (no ThreadSession refactor):
* MediaLeg enum { WebRTC(RtcSession), Trunk(TrunkSession<TapAudioPipe>) }
+ as_webrtc_mut + channel_id + channel_state + is_closed + set_tap_handle
helpers (dead_code-suppressed per AGENTS.md with documented rationale;
Step B will wire them).
* run_per_leg_tick dispatch pub fn matching on MediaLeg: WebRTC => media
crate's loop_driver::drive (unchanged), Trunk => rutster_trunk's
loop_driver::drive (NEW slice-5). The seam gate holds: trunk leg never
enters the media crate's loop_driver.rs.
* MediaCmd::RegisterTrunk variant + placeholder arm (drops mpsc ends,
drops oneshot reply without sending -- pump task's reply_rx.await
returns Err + closes WSS gracefully per the existing cmd-rejection
posture for Register admission control).
* Two HTTP routes: POST /v1/trunk/sessions (503 stub -- the originate
handler needs the CallControlClient trait threaded into AppState,
Step B or dev-b handover) + POST /v1/trunk/webhook (returns TwiML
with hardcoded loopback Media Streams fork URL -- T5 Step B + dev-b's
TwilioCredentials env parser will populate webhook_base).
* main.rs: spawned trunk_register relay task that converts
RegisterTrunkInboundChannel -> MediaCmd::RegisterTrunk + awaits
oneshot reply, plus mounts TwilioMediaStreamsServer::router alongside
the existing /v1/sessions routes.
Step B (deferred to follow-up commit / dev-b handover):
* Full ThreadSession refactor to use leg: MediaLeg instead of rtc:
RtcSession for the WebRTC code path's existing tests (4 tests).
* Actual RegisterTrunk handler body (spawn_tap_engine + Reflex +
LocalVadReflex composition + TrunkSession construction).
* ADR-0009 honoring verification (TwilioCredentials never flow through
this module -- the call_sid + tap_url fields are operational
correlation IDs, not credentials).
* T7 reflex-on-trunk + T8 PSTN-sim e2e integration tests, which
pin behavior end-to-end + force the Step B refactor's correctness.
ADR-0007 honored: zero SIP bytes parsed; wire surface in this commit is
JSON Twilio Media Streams protocol + HTTP/REST + axum router merge.
Signed-off-by: Aaron D. Lee <himself@adlee.work>
Aaron D. Lee
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