Stream a call's live transcript

GET

/calls/{id}/transcript/stream

import MoreVoice from "@morevoice/sdk";

const mv = new MoreVoice(); // MOREVOICE_API_KEY from the environment

for await (const event of mv.calls.transcriptStream("call_7Hk2Lm9Qp")) {
  console.log(event.type, event.data.object);
}

import os

import httpx

url = "https://api.morevoice.ai/v1/calls/call_7Hk2Lm9Qp/transcript/stream"
headers = {"Authorization": f"Bearer {os.environ['MOREVOICE_API_KEY']}", "Accept": "text/event-stream"}
with httpx.stream("GET", url, headers=headers, timeout=None) as response:
    response.raise_for_status()
    for line in response.iter_lines():
        if line.startswith("data:"):
            print(line[5:].strip())

Server-Sent Events with what is said on a call as it is said: transcript.partial while a line is spoken (its text so far) and transcript.final when it is complete. A final supersedes the partials with the same utterance_id. speaker is customer (the caller), assistant (the AI), agent (a human agent), supervisor or external (a transfer party); AI and human calls alike. start_ms and end_ms are when the line began and became final, in milliseconds from the call’s start, as observed live (null for lines spoken before the stream connected; the call’s transcript has the exact times after the call). The stream starts with the conversation so far and ends with call.ended. Reconnect with Last-Event-ID to get only what you missed. Send partials=false for complete lines only. Counts against the key’s stream limit (concurrency_limit, limit_type: api_streams).

Try it in the API playground with a test-mode key.

Authorizations

bearerAuth

Parameters

Path Parameters

required

string

<= 200 characters /^call_[0-9A-Za-z]+$/

A call ID (call_…).

Query Parameters

partials

string

Allowed values: true false

false: only complete lines (transcript.final), no partials. Default true.

last_event_id

string

>= 1 characters <= 200 characters

Resume after this event, for clients that cannot send the Last-Event-ID header (the header wins when both are sent).

Header Parameters

MoreVoice-Version

string

/^\d{4}-\d{2}-\d{2}$/

The API version to use for this request. Defaults to the version the API key is pinned to.

Example

2026-11-01

Responses

200

The transcript stream.

text/event-stream

A text/event-stream of transcript.partial and transcript.final events, then call.ended. Each frame is id: <call_…>:<n>, event: <type> and one data: line with the event envelope; data.object is the line: call_id, utterance_id (a final supersedes the partials with the same id), speaker (customer, assistant, agent, supervisor or external), role (the internal role), text, final, interrupted (the caller cut the assistant off), start_ms and end_ms (ms from the call’s start, observed live; null when unknown) and language (the call’s configured language, BCP 47; null when unknown). Comment lines (: ping) keep the connection alive every 15 s.

string

400

The request is invalid: a parameter is missing, malformed or unknown, or the version header is unknown.

application/json

Every /v1 error.

object

error

required

object

code

required

A stable, machine-readable code from the error-code catalogue.

string

details

Structured context, e.g. required_scope or the compliance verdict.

object

key

additional properties

doc_url

required

A link to the documentation of this code.

string

message

required

A human-readable explanation. Do not parse it.

string

param

The request parameter the error relates to, e.g. to or metadata[order_id].

string

request_id

required

The X-Request-Id of this request. Quote it when you contact support.

string

type

required

The category of the error.

string

Allowed values: invalid_request_error authentication_error permission_error not_found conflict rate_limit_error compliance_error idempotency_error api_error

Example

{
  "error": {
    "code": "parameter_missing",
    "doc_url": "https://docs.morevoice.ai/api/errors#parameter-missing",
    "message": "Missing required parameter: to.",
    "param": "to",
    "request_id": "req_7Hk2LmN9pQ4rS6tV8wX0yZ",
    "type": "invalid_request_error"
  }
}

Headers

X-Request-Id

string

The request’s ID (req_…). Quote it when you contact support.

401

No valid API key was sent.

application/json

Every /v1 error.

object

error

required

object

code

required

A stable, machine-readable code from the error-code catalogue.

string

details

Structured context, e.g. required_scope or the compliance verdict.

object

key

additional properties

doc_url

required

A link to the documentation of this code.

string

message

required

A human-readable explanation. Do not parse it.

string

param

The request parameter the error relates to, e.g. to or metadata[order_id].

string

request_id

required

The X-Request-Id of this request. Quote it when you contact support.

string

type

required

The category of the error.

string

Allowed values: invalid_request_error authentication_error permission_error not_found conflict rate_limit_error compliance_error idempotency_error api_error

Example

{
  "error": {
    "code": "invalid_api_key",
    "doc_url": "https://docs.morevoice.ai/api/errors#invalid-api-key",
    "message": "Invalid API key.",
    "request_id": "req_7Hk2LmN9pQ4rS6tV8wX0yZ",
    "type": "authentication_error"
  }
}

Headers

X-Request-Id

string

The request’s ID (req_…). Quote it when you contact support.

403

The key may not do this (a missing scope, a plan limit, or a compliance block).

application/json

Every /v1 error.

object

error

required

object

code

required

A stable, machine-readable code from the error-code catalogue.

string

details

Structured context, e.g. required_scope or the compliance verdict.

object

key

additional properties

doc_url

required

A link to the documentation of this code.

string

message

required

A human-readable explanation. Do not parse it.

string

param

The request parameter the error relates to, e.g. to or metadata[order_id].

string

request_id

required

The X-Request-Id of this request. Quote it when you contact support.

string

type

required

The category of the error.

string

Allowed values: invalid_request_error authentication_error permission_error not_found conflict rate_limit_error compliance_error idempotency_error api_error

Example

{
  "error": {
    "code": "missing_scope",
    "doc_url": "https://docs.morevoice.ai/api/errors#missing-scope",
    "message": "This API key lacks the calls:write scope.",
    "request_id": "req_7Hk2LmN9pQ4rS6tV8wX0yZ",
    "type": "permission_error"
  }
}

Headers

X-Request-Id

string

The request’s ID (req_…). Quote it when you contact support.

404

No object with this ID exists in this organisation and mode.

application/json

Every /v1 error.

object

error

required

object

code

required

A stable, machine-readable code from the error-code catalogue.

string

details

Structured context, e.g. required_scope or the compliance verdict.

object

key

additional properties

doc_url

required

A link to the documentation of this code.

string

message

required

A human-readable explanation. Do not parse it.

string

param

The request parameter the error relates to, e.g. to or metadata[order_id].

string

request_id

required

The X-Request-Id of this request. Quote it when you contact support.

string

type

required

The category of the error.

string

Allowed values: invalid_request_error authentication_error permission_error not_found conflict rate_limit_error compliance_error idempotency_error api_error

Example

{
  "error": {
    "code": "resource_missing",
    "doc_url": "https://docs.morevoice.ai/api/errors#resource-missing",
    "message": "No such object: 'call_4Gk2'.",
    "param": "id",
    "request_id": "req_7Hk2LmN9pQ4rS6tV8wX0yZ",
    "type": "not_found"
  }
}

Headers

X-Request-Id

string

The request’s ID (req_…). Quote it when you contact support.

429

Too many requests, or no call capacity right now. Retry after the Retry-After delay.

application/json

Every /v1 error.

object

error

required

object

code

required

A stable, machine-readable code from the error-code catalogue.

string

details

Structured context, e.g. required_scope or the compliance verdict.

object

key

additional properties

doc_url

required

A link to the documentation of this code.

string

message

required

A human-readable explanation. Do not parse it.

string

param

The request parameter the error relates to, e.g. to or metadata[order_id].

string

request_id

required

The X-Request-Id of this request. Quote it when you contact support.

string

type

required

The category of the error.

string

Allowed values: invalid_request_error authentication_error permission_error not_found conflict rate_limit_error compliance_error idempotency_error api_error

Example

{
  "error": {
    "code": "rate_limited",
    "doc_url": "https://docs.morevoice.ai/api/errors#rate-limited",
    "message": "Too many requests. Retry after 1 second.",
    "request_id": "req_7Hk2LmN9pQ4rS6tV8wX0yZ",
    "type": "rate_limit_error"
  }
}

Headers

Retry-After

integer

Seconds to wait before retrying.

X-Request-Id

string

The request’s ID (req_…). Quote it when you contact support.

500

Something went wrong on MoreVoice’s side. Retry with the same Idempotency-Key.

application/json

Every /v1 error.

object

error

required

object

code

required

A stable, machine-readable code from the error-code catalogue.

string

details

Structured context, e.g. required_scope or the compliance verdict.

object

key

additional properties

doc_url

required

A link to the documentation of this code.

string

message

required

A human-readable explanation. Do not parse it.

string

param

The request parameter the error relates to, e.g. to or metadata[order_id].

string

request_id

required

The X-Request-Id of this request. Quote it when you contact support.

string

type

required

The category of the error.

string

Allowed values: invalid_request_error authentication_error permission_error not_found conflict rate_limit_error compliance_error idempotency_error api_error

Example

{
  "error": {
    "code": "internal_error",
    "doc_url": "https://docs.morevoice.ai/api/errors#internal-error",
    "message": "Something went wrong on MoreVoice's side.",
    "request_id": "req_7Hk2LmN9pQ4rS6tV8wX0yZ",
    "type": "api_error"
  }
}

Headers

X-Request-Id

string

The request’s ID (req_…). Quote it when you contact support.