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Telnyx's bidirectional stream uses different codecs per direction:
- Dograh → Telnyx: what we declare via `stream_bidirectional_codec`
- Telnyx → Dograh: whatever the PSTN leg negotiated (PCMA for UK,
Europe, India termination; PCMU for US), announced as
`media_format.encoding` on the WebSocket start message.
We hardcoded both directions on the serializer to PCMU, so any call
whose PSTN leg used PCMA arrived as A-law bytes that we decoded
through a μ-law table → static for the entire call.
`handle_websocket` now extracts `media_format.encoding` from the
start message and threads it through `transport_kwargs`. The
serializer uses it for the Telnyx → Dograh direction; the
Dograh → Telnyx direction stays pinned to PCMU to match the
unchanged `stream_bidirectional_codec` in the dial/answer payloads.
Note: pipecat's `TelnyxFrameSerializer` names its params from the
call's POV, not Dograh's — `inbound_encoding` is what we send into
the call, `outbound_encoding` is what we receive. Easy to mix up.
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| .. | ||
| alembic | ||
| assets | ||
| db | ||
| errors | ||
| mcp_server | ||
| native/rnnoise | ||
| routes | ||
| schemas | ||
| services | ||
| tasks | ||
| tests | ||
| utils | ||
| .cursorignore | ||
| .dockerignore | ||
| .env.example | ||
| .gitignore | ||
| __init__.py | ||
| AGENTS.md | ||
| alembic.ini | ||
| app.py | ||
| CLAUDE.md | ||
| conftest.py | ||
| constants.py | ||
| Dockerfile | ||
| enums.py | ||
| logging_config.py | ||
| pyproject.toml | ||
| pytest.ini | ||
| requirements.dev.txt | ||
| requirements.txt | ||
| sdk_expose.py | ||