# Trouble in delivering responses **URL:** \ **Category:** Voice, Speech & Language\ **Tags:** unreal-engine\ **Created:** [July 23, 2026, 9:44pm UTC](https://forum.convai.com/t/trouble-in-delivering-responses/6411 "2026-07-23T21:44:03Z")\ **Posts on this page:** 5\ **Page:** 1
**Author:** ![Christopher\_Mapes](https://yyz2.discourse-cdn.com/flex004/user_avatar/forum.convai.com/christopher_mapes/32/4444_2.png) [@Christopher\_Mapes](https://forum.convai.com/u/Christopher_Mapes)\ **Post date:** [July 23, 2026, 9:44pm UTC](https://forum.convai.com/t/trouble-in-delivering-responses/6411/1 "2026-07-23T21:44:03Z")
### What do you need help with? Bug report ### Issue area Text-to-Speech / TTS ### Impact Normal - something is not working as expected ### Character ID 9a3bf84e-848e-11f1-8569-42010a7be02f ### Session ID 12084b7258f8477f928228f3b0b10460 ### Where does it happen? API / Backend ### Language English ### Voice provider Eleven Labs ### Voice name Will ### Environment Unreal build 5.6 ### Short summary Character struggles to deliver speech items. Seems to be caching problem or network connection, but we have a killer connection - ### User input Hi ### What happened? Plays ok through playground, but we are using the API interface and are seeing this on different machine from multiple locations. we have gone through all options, changed LLM models etc. ### What did you expect? Should execute a standard communication. We are seeing this on multiple character IDs. they have different designed convai options. ### Steps to reproduce Use an unreal engine EXE with convai plugin that utilizes the API for speech. ### I checked the relevant documentation, resources, and similar forum posts before posting. on ### I confirm that I did not include API keys, tokens, passwords, secrets, private character data, private conversation logs, or customer data. on ---
**Author:** ![K3](https://yyz2.discourse-cdn.com/flex004/user_avatar/forum.convai.com/k3/32/2611_2.png) [@K3](https://forum.convai.com/u/K3)\ **Post date:** [July 24, 2026, 6:43am UTC](https://forum.convai.com/t/trouble-in-delivering-responses/6411/2 "2026-07-24T06:43:04Z")
Hello, Unfortunately, I’m not fully sure I understand the issue from the description alone. Could you please share a video recording showing the behavior, along with the relevant logs from the Unreal build? Also, is there a specific reason why you are using the API directly instead of the Convai Unreal Engine Plugin for this setup? Understanding your integration approach will help us review the issue more accurately. ---
**Author:** ![Christopher\_Mapes](https://yyz2.discourse-cdn.com/flex004/user_avatar/forum.convai.com/christopher_mapes/32/4444_2.png) [@Christopher\_Mapes](https://forum.convai.com/u/Christopher_Mapes)\ **Post date:** [July 24, 2026, 5:05pm UTC](https://forum.convai.com/t/trouble-in-delivering-responses/6411/3 "2026-07-24T17:05:19Z")
We do integrate via the Convai Unreal Engine plugin (gRPC streaming, [stream.convai.com](http://stream.convai.com)) and have a live training demonstration coming up, so streaming reliability is critical for us. We did extensive isolation testing and want to share what we found and lay out what we need from you. What we measured (via a standalone gRPC emulator of the plugin — i.e., not our application code — across every character on our account): - gRPC streaming success dropped hard and has been recovering over the last ~day: roughly 17% → 67% → 92%. - Failures were initially DEADLINE\_EXCEEDED (streams hanging ~60s with no audio), and are now UNKNOWN — “Unable to generate audio response” (~8% of calls, even at “recovered”). - The REST getResponse API ([api.convai.com](http://api.convai.com)) was 100% reliable the entire time — same account, characters, network, and time window. So this is isolated to the gRPC streaming path, not our integration. What we’re asking for: 1. Root cause / confirmation: Was there a known incident on the gRPC streaming service or the audio-generation stage over the past week? What was it? 2. Full resolution of the residual UNKNOWN / “Unable to generate audio response” errors — it’s still ~8% at best right now. 3. Stability assurance: Can you confirm the streaming path is stable, or tell us what to do to ensure it? 4. Recommended configuration to minimize exposure — voice provider (e.g., Azure/GCP/ElevenLabs vs. a Fish-Audio-backed voice), foundation model, and any gRPC deadline / retry guidance for the Unreal plugin. 5. How to monitor streaming-service health in real time (status-page component or an incident channel), so we can see degradation? ---
**Author:** ![K3](https://yyz2.discourse-cdn.com/flex004/user_avatar/forum.convai.com/k3/32/2611_2.png) [@K3](https://forum.convai.com/u/K3)\ **Post date:** [July 24, 2026, 9:04pm UTC](https://forum.convai.com/t/trouble-in-delivering-responses/6411/4 "2026-07-24T21:04:20Z")
The V3 plugin, which uses gRPC, is now deprecated and no longer receives updates. Could you clarify why you are not using the latest version of Convai, which is V4? ---
**Author:** ![system](https://canada1.discourse-cdn.com/flex004/uploads/convai/original/1X/e60ef96aa7334c5ccf6682f6c6dbc20fcfa96b49.png) [@system](https://forum.convai.com/u/system)\ **Post date:** [August 26, 2026, 4:45pm UTC](https://forum.convai.com/t/trouble-in-delivering-responses/6411/5 "2026-08-26T16:45:27Z")
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