Patch Update to Voice AI Agent API

PATCH

agent

{agent_id}

cURL

curl --request PATCH \
  --url https://api.bolna.ai/v2/agent/{agent_id} \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "agent_config": {
    "agent_name": "Alfred",
    "agent_welcome_message": "How are you doing Bruce?",
    "webhook_url": null,
    "ingest_source_config": {
      "source_type": "api",
      "source_url": "https://example.com/api/data",
      "source_auth_token": "abc123",
      "source_name": "leads_sheet_june.csv"
    },
    "telephony_provider": "sip-trunk",
    "calling_guardrails": {
      "call_start_hour": 9,
      "call_end_hour": 21
    }
  },
  "agent_prompts": {}
}
'

import requests

url = "https://api.bolna.ai/v2/agent/{agent_id}"

payload = {
    "agent_config": {
        "agent_name": "Alfred",
        "agent_welcome_message": "How are you doing Bruce?",
        "webhook_url": None,
        "ingest_source_config": {
            "source_type": "api",
            "source_url": "https://example.com/api/data",
            "source_auth_token": "abc123",
            "source_name": "leads_sheet_june.csv"
        },
        "telephony_provider": "sip-trunk",
        "calling_guardrails": {
            "call_start_hour": 9,
            "call_end_hour": 21
        }
    },
    "agent_prompts": {}
}
headers = {
    "Authorization": "Bearer <token>",
    "Content-Type": "application/json"
}

response = requests.patch(url, json=payload, headers=headers)

print(response.text)

const options = {
  method: 'PATCH',
  headers: {Authorization: 'Bearer <token>', 'Content-Type': 'application/json'},
  body: JSON.stringify({
    agent_config: {
      agent_name: 'Alfred',
      agent_welcome_message: 'How are you doing Bruce?',
      webhook_url: null,
      ingest_source_config: {
        source_type: 'api',
        source_url: 'https://example.com/api/data',
        source_auth_token: 'abc123',
        source_name: 'leads_sheet_june.csv'
      },
      telephony_provider: 'sip-trunk',
      calling_guardrails: {call_start_hour: 9, call_end_hour: 21}
    },
    agent_prompts: {}
  })
};

fetch('https://api.bolna.ai/v2/agent/{agent_id}', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

<?php

$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_URL => "https://api.bolna.ai/v2/agent/{agent_id}",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "PATCH",
  CURLOPT_POSTFIELDS => json_encode([
    'agent_config' => [
        'agent_name' => 'Alfred',
        'agent_welcome_message' => 'How are you doing Bruce?',
        'webhook_url' => null,
        'ingest_source_config' => [
                'source_type' => 'api',
                'source_url' => 'https://example.com/api/data',
                'source_auth_token' => 'abc123',
                'source_name' => 'leads_sheet_june.csv'
        ],
        'telephony_provider' => 'sip-trunk',
        'calling_guardrails' => [
                'call_start_hour' => 9,
                'call_end_hour' => 21
        ]
    ],
    'agent_prompts' => [
        
    ]
  ]),
  CURLOPT_HTTPHEADER => [
    "Authorization: Bearer <token>",
    "Content-Type: application/json"
  ],
]);

$response = curl_exec($curl);
$err = curl_error($curl);

curl_close($curl);

if ($err) {
  echo "cURL Error #:" . $err;
} else {
  echo $response;
}

package main

import (
	"fmt"
	"strings"
	"net/http"
	"io"
)

func main() {

	url := "https://api.bolna.ai/v2/agent/{agent_id}"

	payload := strings.NewReader("{\n  \"agent_config\": {\n    \"agent_name\": \"Alfred\",\n    \"agent_welcome_message\": \"How are you doing Bruce?\",\n    \"webhook_url\": null,\n    \"ingest_source_config\": {\n      \"source_type\": \"api\",\n      \"source_url\": \"https://example.com/api/data\",\n      \"source_auth_token\": \"abc123\",\n      \"source_name\": \"leads_sheet_june.csv\"\n    },\n    \"telephony_provider\": \"sip-trunk\",\n    \"calling_guardrails\": {\n      \"call_start_hour\": 9,\n      \"call_end_hour\": 21\n    }\n  },\n  \"agent_prompts\": {}\n}")

	req, _ := http.NewRequest("PATCH", url, payload)

	req.Header.Add("Authorization", "Bearer <token>")
	req.Header.Add("Content-Type", "application/json")

	res, _ := http.DefaultClient.Do(req)

	defer res.Body.Close()
	body, _ := io.ReadAll(res.Body)

	fmt.Println(string(body))

}

HttpResponse<String> response = Unirest.patch("https://api.bolna.ai/v2/agent/{agent_id}")
  .header("Authorization", "Bearer <token>")
  .header("Content-Type", "application/json")
  .body("{\n  \"agent_config\": {\n    \"agent_name\": \"Alfred\",\n    \"agent_welcome_message\": \"How are you doing Bruce?\",\n    \"webhook_url\": null,\n    \"ingest_source_config\": {\n      \"source_type\": \"api\",\n      \"source_url\": \"https://example.com/api/data\",\n      \"source_auth_token\": \"abc123\",\n      \"source_name\": \"leads_sheet_june.csv\"\n    },\n    \"telephony_provider\": \"sip-trunk\",\n    \"calling_guardrails\": {\n      \"call_start_hour\": 9,\n      \"call_end_hour\": 21\n    }\n  },\n  \"agent_prompts\": {}\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api.bolna.ai/v2/agent/{agent_id}")

http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true

request = Net::HTTP::Patch.new(url)
request["Authorization"] = 'Bearer <token>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"agent_config\": {\n    \"agent_name\": \"Alfred\",\n    \"agent_welcome_message\": \"How are you doing Bruce?\",\n    \"webhook_url\": null,\n    \"ingest_source_config\": {\n      \"source_type\": \"api\",\n      \"source_url\": \"https://example.com/api/data\",\n      \"source_auth_token\": \"abc123\",\n      \"source_name\": \"leads_sheet_june.csv\"\n    },\n    \"telephony_provider\": \"sip-trunk\",\n    \"calling_guardrails\": {\n      \"call_start_hour\": 9,\n      \"call_end_hour\": 21\n    }\n  },\n  \"agent_prompts\": {}\n}"

response = http.request(request)
puts response.read_body

{
  "message": "success",
  "state": "updated"
}

{
  "error": 123,
  "message": "<string>"
}

Partially update an existing agent. Unlike the full update (PUT), which replaces the entire agent configuration, PATCH only touches the attributes you include in the request body — everything else is left unchanged. Returns HTTP 200 with { "message": "success", "state": "updated" }.

Use PATCH for small, targeted edits (renaming an agent, swapping a voice, updating a webhook URL). Use PUT when you need to rewrite tasks, toolchains, or the full prompt structure.

Updatable attributes

Only the following attributes can be updated via PATCH. Any other field in the body is ignored.

Attribute	Location	Description
`agent_name`	`agent_config`	Display name of the agent.
`agent_welcome_message`	`agent_config`	First message the agent speaks when a call connects.
`webhook_url`	`agent_config`	URL that receives the execution payload as call status changes. Whitelist source IP `13.203.39.153`. Pass `null` to remove it.
`synthesizer`	`agent_config`	Text-to-speech configuration (provider, voice, model, etc.).
`ingest_source_config`	`agent_config`	CRM ingestion source for inbound agents (`api`, `csv`, or `google_sheet`).
`telephony_provider`	`agent_config`	Telephony provider. Changing it auto-updates the audio format.
`calling_guardrails`	`agent_config`	Time-based restrictions for outbound calls.
`agent_prompts`	top-level	Prompts per task, keyed as `task_1`, `task_2`, …

All agent-config attributes go inside the agent_config object. agent_prompts is a top-level key, a sibling of agent_config.

calling_guardrails

Restrict when your agent places outbound calls. Calls triggered outside the allowed window are automatically rescheduled to the next allowed start time in the recipient’s timezone. It accepts two keys:

Key	Type	Description
`call_start_hour`	integer (0–23)	Start of the allowed calling window, 24-hour format.
`call_end_hour`	integer (0–23)	End of the allowed calling window, 24-hour format. Must be `≥ call_start_hour`.

Update calling guardrails

{
  "agent_config": {
    "calling_guardrails": {
      "call_start_hour": 9,
      "call_end_hour": 21
    }
  }
}

Hours use 24-hour format: 0 = midnight, 9 = 9 AM, 17 = 5 PM, 21 = 9 PM. See the Calling Guardrails guide for rescheduling behavior and regional calling regulations.

telephony_provider

Switch the telephony provider the agent uses. When changed, the agent’s audio input/output format is updated automatically to match the provider (wav for twilio/plivo/exotel/vobiz, ulaw for sip-trunk). Accepted values: twilio, plivo, exotel, vobiz, sip-trunk, default.

Switch to SIP trunk

{
  "agent_config": {
    "telephony_provider": "sip-trunk"
  }
}

If you patch telephony_provider to sip-trunk, the next step is to set the inbound agent so your SIP trunk phone number maps to this agent for receiving inbound calls.

Examples

{
  "agent_config": {
    "agent_name": "Support Agent v2",
    "agent_welcome_message": "Hi! Thanks for calling. How can I help?"
  }
}

{
  "agent_config": {
    "webhook_url": "https://your-server.com/bolna-webhook"
  }
}

{
  "agent_config": {
    "synthesizer": {
      "provider": "elevenlabs",
      "provider_config": {
        "voice": "Nila",
        "voice_id": "V9LCAAi4tTlqe9JadbCo",
        "model": "eleven_turbo_v2_5"
      },
      "stream": true,
      "buffer_size": 250,
      "audio_format": "wav"
    }
  }
}

{
  "agent_prompts": {
    "task_1": {
      "system_prompt": "You are a helpful support agent. Keep replies short."
    }
  }
}

You can also combine multiple attributes in a single request:

Combined patch

{
  "agent_config": {
    "agent_name": "Sales Agent",
    "webhook_url": "https://your-server.com/bolna-webhook",
    "telephony_provider": "plivo",
    "calling_guardrails": {
      "call_start_hour": 9,
      "call_end_hour": 21
    }
  },
  "agent_prompts": {
    "task_1": {
      "system_prompt": "You are an outbound sales agent. Be concise and friendly."
    }
  }
}

200 Response

{
  "message": "success",
  "state": "updated"
}

Next steps

Full update (PUT)

Replace the entire agent configuration, tasks, and prompts.

Calling Guardrails

Control outbound call timing and rescheduling.

Set inbound agent

Map a phone number to an agent for inbound calls.

Webhooks

Receive call results without polling.

Authorizations

Authorization

string

header

required

Bearer authentication header of the form Bearer <token>, where <token> is your auth token.

Path Parameters

agent_id

string<uuid>

required

Body

application/json

Update an agent

agent_config

object

Configuration of the agent

Show child attributes

agent_prompts

object

Prompts to be provided to the agent. It can have multiple tasks of the form task_<task_id>

Show child attributes

Response

agent status response

List agentsList all Voice AI agents under your account, along with their names, statuses, and creation dates, using Bolna APIs.

⌘I

cURL

curl --request PATCH \
  --url https://api.bolna.ai/v2/agent/{agent_id} \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "agent_config": {
    "agent_name": "Alfred",
    "agent_welcome_message": "How are you doing Bruce?",
    "webhook_url": null,
    "ingest_source_config": {
      "source_type": "api",
      "source_url": "https://example.com/api/data",
      "source_auth_token": "abc123",
      "source_name": "leads_sheet_june.csv"
    },
    "telephony_provider": "sip-trunk",
    "calling_guardrails": {
      "call_start_hour": 9,
      "call_end_hour": 21
    }
  },
  "agent_prompts": {}
}
'

import requests

url = "https://api.bolna.ai/v2/agent/{agent_id}"

payload = {
    "agent_config": {
        "agent_name": "Alfred",
        "agent_welcome_message": "How are you doing Bruce?",
        "webhook_url": None,
        "ingest_source_config": {
            "source_type": "api",
            "source_url": "https://example.com/api/data",
            "source_auth_token": "abc123",
            "source_name": "leads_sheet_june.csv"
        },
        "telephony_provider": "sip-trunk",
        "calling_guardrails": {
            "call_start_hour": 9,
            "call_end_hour": 21
        }
    },
    "agent_prompts": {}
}
headers = {
    "Authorization": "Bearer <token>",
    "Content-Type": "application/json"
}

response = requests.patch(url, json=payload, headers=headers)

print(response.text)

const options = {
  method: 'PATCH',
  headers: {Authorization: 'Bearer <token>', 'Content-Type': 'application/json'},
  body: JSON.stringify({
    agent_config: {
      agent_name: 'Alfred',
      agent_welcome_message: 'How are you doing Bruce?',
      webhook_url: null,
      ingest_source_config: {
        source_type: 'api',
        source_url: 'https://example.com/api/data',
        source_auth_token: 'abc123',
        source_name: 'leads_sheet_june.csv'
      },
      telephony_provider: 'sip-trunk',
      calling_guardrails: {call_start_hour: 9, call_end_hour: 21}
    },
    agent_prompts: {}
  })
};

fetch('https://api.bolna.ai/v2/agent/{agent_id}', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

<?php

$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_URL => "https://api.bolna.ai/v2/agent/{agent_id}",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "PATCH",
  CURLOPT_POSTFIELDS => json_encode([
    'agent_config' => [
        'agent_name' => 'Alfred',
        'agent_welcome_message' => 'How are you doing Bruce?',
        'webhook_url' => null,
        'ingest_source_config' => [
                'source_type' => 'api',
                'source_url' => 'https://example.com/api/data',
                'source_auth_token' => 'abc123',
                'source_name' => 'leads_sheet_june.csv'
        ],
        'telephony_provider' => 'sip-trunk',
        'calling_guardrails' => [
                'call_start_hour' => 9,
                'call_end_hour' => 21
        ]
    ],
    'agent_prompts' => [
        
    ]
  ]),
  CURLOPT_HTTPHEADER => [
    "Authorization: Bearer <token>",
    "Content-Type: application/json"
  ],
]);

$response = curl_exec($curl);
$err = curl_error($curl);

curl_close($curl);

if ($err) {
  echo "cURL Error #:" . $err;
} else {
  echo $response;
}

package main

import (
	"fmt"
	"strings"
	"net/http"
	"io"
)

func main() {

	url := "https://api.bolna.ai/v2/agent/{agent_id}"

	payload := strings.NewReader("{\n  \"agent_config\": {\n    \"agent_name\": \"Alfred\",\n    \"agent_welcome_message\": \"How are you doing Bruce?\",\n    \"webhook_url\": null,\n    \"ingest_source_config\": {\n      \"source_type\": \"api\",\n      \"source_url\": \"https://example.com/api/data\",\n      \"source_auth_token\": \"abc123\",\n      \"source_name\": \"leads_sheet_june.csv\"\n    },\n    \"telephony_provider\": \"sip-trunk\",\n    \"calling_guardrails\": {\n      \"call_start_hour\": 9,\n      \"call_end_hour\": 21\n    }\n  },\n  \"agent_prompts\": {}\n}")

	req, _ := http.NewRequest("PATCH", url, payload)

	req.Header.Add("Authorization", "Bearer <token>")
	req.Header.Add("Content-Type", "application/json")

	res, _ := http.DefaultClient.Do(req)

	defer res.Body.Close()
	body, _ := io.ReadAll(res.Body)

	fmt.Println(string(body))

}

HttpResponse<String> response = Unirest.patch("https://api.bolna.ai/v2/agent/{agent_id}")
  .header("Authorization", "Bearer <token>")
  .header("Content-Type", "application/json")
  .body("{\n  \"agent_config\": {\n    \"agent_name\": \"Alfred\",\n    \"agent_welcome_message\": \"How are you doing Bruce?\",\n    \"webhook_url\": null,\n    \"ingest_source_config\": {\n      \"source_type\": \"api\",\n      \"source_url\": \"https://example.com/api/data\",\n      \"source_auth_token\": \"abc123\",\n      \"source_name\": \"leads_sheet_june.csv\"\n    },\n    \"telephony_provider\": \"sip-trunk\",\n    \"calling_guardrails\": {\n      \"call_start_hour\": 9,\n      \"call_end_hour\": 21\n    }\n  },\n  \"agent_prompts\": {}\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api.bolna.ai/v2/agent/{agent_id}")

http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true

request = Net::HTTP::Patch.new(url)
request["Authorization"] = 'Bearer <token>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"agent_config\": {\n    \"agent_name\": \"Alfred\",\n    \"agent_welcome_message\": \"How are you doing Bruce?\",\n    \"webhook_url\": null,\n    \"ingest_source_config\": {\n      \"source_type\": \"api\",\n      \"source_url\": \"https://example.com/api/data\",\n      \"source_auth_token\": \"abc123\",\n      \"source_name\": \"leads_sheet_june.csv\"\n    },\n    \"telephony_provider\": \"sip-trunk\",\n    \"calling_guardrails\": {\n      \"call_start_hour\": 9,\n      \"call_end_hour\": 21\n    }\n  },\n  \"agent_prompts\": {}\n}"

response = http.request(request)
puts response.read_body

{
  "message": "success",
  "state": "updated"
}

{
  "error": 123,
  "message": "<string>"
}

Overview

Agents

Calls

Executions

Batches

Inbound

Phone Numbers

Knowledgebases

Dispositions

Providers

Sub-Accounts

Voice

User

SIP Trunks (BYOT)

Violations

Legacy APIs

Patch Update to Voice AI Agent API

Updatable attributes

calling_guardrails

telephony_provider

Examples

Next steps

Full update (PUT)

Calling Guardrails

Set inbound agent

Webhooks

Authorizations

Path Parameters

Body

Response

​Updatable attributes

​calling_guardrails

​telephony_provider

​Examples

​Next steps

Full update (PUT)

Calling Guardrails

Set inbound agent

Webhooks

Authorizations

Path Parameters

Body

Response

Updatable attributes

calling_guardrails

telephony_provider

Examples

Next steps