Best possible solution:

Land this replacement after the exact-head validation issue is cleared, preserving the manager-result handoff and Plivo GetInput continuation while closing the older conflicting source PR as superseded.

Do we have a high-confidence way to reproduce the issue?

Yes. Source inspection shows current main's generic processParsedEvents only calls manager.processEvent, while manager call.speech records/listens and only the media-stream sibling calls handleInboundResponse; the linked issue and superseded PR add live Telnyx evidence.

Is this the best way to solve the issue?

Yes. Returning a closed final-speech result from manager while keeping response generation in the webhook server is the narrow owner-boundary fix; moving agent response work into manager events would couple state handling to runtime side effects.

AGENTS.md: found and applied where relevant.

Codex review notes: model internal, reasoning high; reviewed against 78685aec4686.

Label changes:

• add P1: The PR fixes a real voice-call workflow where carrier webhook transcripts are captured but no bot reply is spoken back to the caller.
• add merge-risk: 🚨 message-delivery: The diff changes the generic voice-call webhook speech path that decides whether callers receive exactly one bot response after speaking.
• add proof: sufficient: Contributor real behavior proof is sufficient. The PR body and superseded source PR include after-fix live Telnyx logs and a redacted persisted multi-turn transcript showing caller speech followed by audible bot replies.
• add rating: 🐚 platinum hermit: Overall readiness is 🐚 platinum hermit; proof is 🦞 diamond lobster and patch quality is 🐚 platinum hermit.
• add status: 👀 ready for maintainer look: ClawSweeper has no concrete contributor-facing blocker left for this PR. Sufficient (logs): The PR body and superseded source PR include after-fix live Telnyx logs and a redacted persisted multi-turn transcript showing caller speech followed by audible bot replies.

Label justifications:

• P1: The PR fixes a real voice-call workflow where carrier webhook transcripts are captured but no bot reply is spoken back to the caller.
• merge-risk: 🚨 message-delivery: The diff changes the generic voice-call webhook speech path that decides whether callers receive exactly one bot response after speaking.
• rating: 🐚 platinum hermit: Overall readiness is 🐚 platinum hermit; proof is 🦞 diamond lobster and patch quality is 🐚 platinum hermit.
• status: 👀 ready for maintainer look: ClawSweeper has no concrete contributor-facing blocker left for this PR. Sufficient (logs): The PR body and superseded source PR include after-fix live Telnyx logs and a redacted persisted multi-turn transcript showing caller speech followed by audible bot replies.
• proof: sufficient: Contributor real behavior proof is sufficient. The PR body and superseded source PR include after-fix live Telnyx logs and a redacted persisted multi-turn transcript showing caller speech followed by audible bot replies.

PR surface:

Source +67, Tests +174. Total +241 across 11 files.

What I checked:

• Current main missing generic handoff: On current main, the generic parsed-webhook path only calls manager.processEvent, while the media-stream sibling path separately calls handleInboundResponse; manager call.speech itself only records/transitions state. (extensions/voice-call/src/webhook.ts:958, 78685aec4686)
• PR owner-boundary fix: The PR head makes manager.processEvent return a closed ProcessEventResult and lets the webhook server own the async auto-response side effect only for final speech that was not consumed by a transcript waiter. (extensions/voice-call/src/webhook.ts:959, 524a4c1d1632)
• Replay/waiter regression coverage: PR tests assert dedupe replays return ignored, final speech reports waiterResolved, and mismatched turn-token speech remains ignored without resolving the waiter. (extensions/voice-call/src/manager.closed-loop.test.ts:133, 524a4c1d1632)
• Plivo XML contract check: Official Plivo docs show GetInput supports nested Speak and speech input; the PR emits nested Speak inside GetInput with speechEndTimeout=2 and regression coverage for that XML shape. (extensions/voice-call/src/providers/plivo.ts:535, 524a4c1d1632)
• Related issue and superseded PR: The current PR closes the canonical Telnyx no-reply issue and supersedes the older conflicting contributor PR, preserving that PR's live Telnyx proof in the body.
• Feature history provenance: History shows the voice-call webhook/manager path was restored and later split by steipete, Plivo was introduced by vrknetha, and recent voice-call event/replay work was carried by vincentkoc. (extensions/voice-call/src/webhook.ts:425, 78685aec4686)

Likely related people:

• steipete: Git history shows Peter Steinberger restored the voice-call webhook/Telnyx path and split the manager/event code that this PR changes; this PR also comes from that account with preserved co-authorship. (role: feature-history contributor and current replacement author; confidence: high; commits: 42c17adb5e4d, b5f7ba502de2, 524a4c1d1632; files: extensions/voice-call/src/webhook.ts, extensions/voice-call/src/manager/events.ts, extensions/voice-call/src/manager/outbound.ts)
• vincentkoc: Recent voice-call replay, retry, and release-history work touched the same manager/events and provider webhook surfaces. (role: recent area contributor; confidence: medium; commits: e085fa1a3ffd, 20248c475f18, 0369bd75c1cd; files: extensions/voice-call/src/manager/events.ts, extensions/voice-call/src/providers/telnyx.ts, extensions/voice-call/src/webhook.ts)
• vrknetha: History shows vrknetha introduced the Plivo provider and tests, which matter because this PR changes Plivo's GetInput/Speak continuation behavior. (role: provider-surface introducer; confidence: medium; commits: 946b0229e8a4, 2579609922dc; files: extensions/voice-call/src/providers/plivo.ts, extensions/voice-call/src/providers/plivo.test.ts)

• 🦀 challenger crab: rare, exceptional readiness with strong proof, clean implementation, and convincing validation.
• 🦞 diamond lobster: very strong readiness with only minor maintainer review expected.
• 🐚 platinum hermit: good normal PR, likely mergeable with ordinary maintainer review.
• 🦐 gold shrimp: useful signal, but proof or patch confidence is still limited.
• 🦪 silver shellfish: thin signal; proof, validation, or implementation needs work.
• 🧂 unranked krab: not merge-ready because proof is missing/unusable or there are serious correctness or safety concerns.
• 🌊 off-meta tidepool: rating does not apply to this item.

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