GET
/
api
/
calls
/
{call_id}
curl --request GET \
  --url https://api.ultravox.ai/api/calls/{call_id} \
  --header 'X-API-Key: <api-key>'
{
  "callId": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "clientVersion": "<string>",
  "created": "2023-11-07T05:31:56Z",
  "joined": "2023-11-07T05:31:56Z",
  "ended": "2023-11-07T05:31:56Z",
  "endReason": "unjoined",
  "firstSpeaker": "FIRST_SPEAKER_AGENT",
  "firstSpeakerSettings": {
    "user": {
      "fallback": {
        "delay": "<string>",
        "text": "<string>"
      }
    },
    "agent": {
      "uninterruptible": true,
      "text": "<string>",
      "delay": "<string>"
    }
  },
  "inactivityMessages": [
    {
      "duration": "<string>",
      "message": "<string>",
      "endBehavior": "END_BEHAVIOR_UNSPECIFIED"
    }
  ],
  "initialOutputMedium": "MESSAGE_MEDIUM_VOICE",
  "joinTimeout": "30s",
  "joinUrl": "<string>",
  "languageHint": "<string>",
  "maxDuration": "3600s",
  "medium": {
    "webRtc": {},
    "twilio": {},
    "serverWebSocket": {
      "inputSampleRate": 123,
      "outputSampleRate": 123,
      "clientBufferSizeMs": 123
    },
    "telnyx": {},
    "plivo": {},
    "exotel": {}
  },
  "model": "fixie-ai/ultravox",
  "recordingEnabled": false,
  "systemPrompt": "<string>",
  "temperature": 0,
  "timeExceededMessage": "<string>",
  "voice": "<string>",
  "externalVoice": {
    "elevenLabs": {
      "voiceId": "<string>",
      "model": "<string>",
      "speed": 123,
      "useSpeakerBoost": true,
      "style": 123,
      "similarityBoost": 123,
      "stability": 123,
      "pronunciationDictionaries": [
        {
          "dictionaryId": "<string>",
          "versionId": "<string>"
        }
      ]
    },
    "cartesia": {
      "voiceId": "<string>",
      "model": "<string>",
      "speed": 123,
      "emotion": "<string>"
    },
    "playHt": {
      "userId": "<string>",
      "voiceId": "<string>",
      "model": "<string>",
      "speed": 123,
      "quality": "<string>",
      "temperature": 123,
      "emotion": 123,
      "voiceGuidance": 123,
      "styleGuidance": 123,
      "textGuidance": 123,
      "voiceConditioningSeconds": 123
    },
    "lmnt": {
      "voiceId": "<string>",
      "model": "<string>",
      "speed": 123,
      "conversational": true
    }
  },
  "transcriptOptional": true,
  "errorCount": 0,
  "vadSettings": {
    "turnEndpointDelay": "<string>",
    "minimumTurnDuration": "<string>",
    "minimumInterruptionDuration": "<string>",
    "frameActivationThreshold": 123
  },
  "shortSummary": "<string>",
  "summary": "<string>",
  "experimentalSettings": "<any>",
  "metadata": {},
  "initialState": {}
}

Authorizations

​
X-API-Key
string
header
required

API key

Path Parameters

​
call_id
string
required

Response

200 - application/json
​
callId
string
required
​
clientVersion
string | null
required

The version of the client that joined this call.

​
created
string
required
​
joined
string | null
required
​
ended
string | null
required
​
endReason
required

The reason the call ended.

  • unjoined - Client never joined
  • hangup - Client hung up
  • agent_hangup - Agent hung up
  • timeout - Call timed out
  • connection_error - Connection error
  • system_error - System error
Available options:
unjoined,
hangup,
agent_hangup,
timeout,
connection_error,
system_error
​
firstSpeaker
enum<string>
required
deprecated

Who was supposed to talk first when the call started. Typically set to FIRST_SPEAKER_USER for outgoing calls and left as the default (FIRST_SPEAKER_AGENT) otherwise.

Available options:
FIRST_SPEAKER_AGENT,
FIRST_SPEAKER_USER
​
firstSpeakerSettings
object
required

Settings for the initial message to get the call started.

​
initialOutputMedium
enum<string>
required

The medium used initially by the agent. May later be changed by the client.

Available options:
MESSAGE_MEDIUM_VOICE,
MESSAGE_MEDIUM_TEXT
​
joinUrl
string | null
required
​
errorCount
integer
default:0
required

The number of errors in this call.

​
shortSummary
string | null
required

A short summary of the call.

​
summary
string | null
required

A summary of the call.

​
experimentalSettings
any
required

Experimental settings for the call.

​
metadata
object
required

Optional metadata key-value pairs to associate with the call. All values must be strings.

​
initialState
object
required

The initial state of the call which is readable/writable by tools.

​
inactivityMessages
object[]

Messages spoken by the agent when the user is inactive for the specified duration. Durations are cumulative, so a message m > 1 with duration 30s will be spoken 30 seconds after message m-1.

A message the agent should say after some duration. The duration's meaning varies depending on the context.

​
joinTimeout
string
default:30s
​
languageHint
string | null

BCP47 language code that may be used to guide speech recognition.

Maximum length: 16
​
maxDuration
string
default:3600s
​
medium
object

Details about a call's protocol. By default, calls occur over WebRTC using the Ultravox client SDK. Setting a different call medium will prepare the server for a call using a different protocol. At most one call medium may be set.

​
model
string
default:fixie-ai/ultravox
​
recordingEnabled
boolean
default:false
​
systemPrompt
string | null
​
temperature
number
default:0
Required range: 0 <= x <= 1
​
timeExceededMessage
string | null
​
voice
string | null
​
externalVoice
object

A voice not known to Ultravox Realtime that can nonetheless be used for a call. Such voices are significantly less validated than normal voices and you'll be responsible for your own TTS-related errors. Exactly one field must be set.

​
transcriptOptional
boolean
default:true
deprecated

Indicates whether a transcript is optional for the call.

​
vadSettings
object

VAD settings for the call.