WhatsApp Business Platform

Business-Initiated Calls

Updated: May 21, 2026

Overview

The Calling API supports making calls to WhatsApp users from your business.
The user dictates when calls can be received by granting call permissions to the business phone number.

Call sequence diagram

Business-initiated call sequence diagram showing flow between business, Cloud API, and WhatsApp user
Note: The ACCEPTED call status webhook will typically arrive after the call has been established. The Cloud API primarily sends it for call event auditing.

Prerequisites

Before you get started with business-initiated calling, ensure that:
Lastly, before you can call a WhatsApp user, you must obtain their permission to do so.
Learn how to obtain WhatsApp user calling permissions here

Business-initiated calling flow

Part 1: Obtain permission to call the WhatsApp user

You can obtain call permissions from the WhatsApp user in one of the following ways:

Send a call permission request message

You can request call permissions by sending the WhatsApp user a permission request. Send it as a free form message during an open customer service window, or use a template message.

Enable callback_permission_status in call settings

When callback_permission_status is enabled, the user automatically provides call permission to your business when they place a call to you.
Learn how to enable callback_permission_status

WhatsApp user grants permanent permissions

The user can also grant permanent permissions to the business at any time through their business profile.

Part 2: Your business initiates a new call to the WhatsApp user

Now that you have user permission, you can initiate a new call to the WhatsApp user in question.
Use the Calls API with the following request body to initiate a new call:
POST <PHONE_NUMBER_ID>/calls
{
  "messaging_product": "whatsapp",
  "to":"12185552828", // The WhatsApp user's phone number (callee)
  "recipient": "US.13491208655302741918",
  "action":"connect",
  "session" : {
      "sdp_type" : "offer",
      "sdp" : "<<RFC 8866 SDP>>"
  }
}
If there are no errors, you will receive a successful response:
{
  "messaging_product": "whatsapp",
  "calls" : [
    { "id" : "wacid.HBgLMTIxODU1NTI4MjgVAgARGCAyODRQIAFRoA" } // The WhatsApp call ID
   ]
}
Note: Response with error code 138006 indicates a lack of a call request permission for this business number from the WhatsApp user.

Part 3: You establish the call connection using webhook signaling

After you successfully initiate a new call, you receive a Call Connect webhook response containing an SDP Answer from Cloud API. Your business will then apply the SDP Answer from this webhook to your WebRTC stack to initiate the media connection.
{
    "entry": [
        {
            "changes": [
                {
                    "field": "calls",
                    "value": {
                        "calls": [
                            {
                                "biz_opaque_callback_data": "TRx334DUDFTI4Mj", // Arbitrary string passed by business for tracking purposes
                                "session": {
                                    "sdp_type": "answer",
                                    "sdp": "<RFC 8866 SDP>"
                                },
                                "from": "13175551399", // The business phone number placing the call (caller)
                                "connection": {
                                    "webrtc": {
                                        "sdp": "<RFC 8866 SDP>"
                                    }
                                },
                                "id": "wacid.HBgLMTIxODU1NTI4MjgVAgARGCAyODRQIAFRoA", // The WhatsApp call ID
                                "to": "12185552828", // The WhatsApp user's phone number (callee)
                                "to_user_id": "<BSUID>",
                                "to_parent_user_id": "<PARENT_BSUID>",
                                "event": "connect",
                                "timestamp": "1749196895",
                                "direction": "BUSINESS_INITIATED"
                            }
                        ],
                        "contacts": [
                            {
                                "profile": {
                                    "name": "<CALLEE_NAME>",
                                    "username": "<USERNAME>"
                                },
                                "wa_id": "<USER_PHONE_NUMBER>",
                                "user_id": "<BSUID>",
                                "parent_user_id": "<PARENT_BSUID>"
                            }
                        ],
                        "metadata": { // ID and display number for the business phone number placing the call (caller)
                            "phone_number_id": "436666719526789",
                            "display_phone_number": "13175551399"
                        },
                        "messaging_product": "whatsapp"
                    }
                }
            ],
            "id": "366634483210360" // WhatsApp Business Account ID associated with the business phone number
        }
    ],
    "object": "whatsapp_business_account"
},
You then receive an appropriate status webhook, indicating that the call is RINGING, ACCEPTED, or REJECTED:
{
  "entry": [
    {
      "changes": [
        {
          "field": "calls",
          "value": {
            "statuses": [
              {
                "id": "wacid.HBgLMTIxODU1NTI4MjgVAgARGCAyODRQIAFRoA", // The WhatsApp call ID
                "type": "call",
                "status": "[RINGING|ACCEPTED|REJECTED]", // The current call status
                "timestamp": "1749197000",
                "recipient_id": "12185552828", // The WhatsApp user's phone number (callee)
                "recipient_user_id": "<BSUID>",
                "recipient_parent_user_id": "<PARENT_BSUID>"
              }
            ],
            "metadata": { // ID and display number for the business phone number placing the call (caller)
              "phone_number_id": "436666719526789",
              "display_phone_number": "13175551399"
            },
            "messaging_product": "whatsapp"
          }
        }
      ],
      "id": "366634483210360" // WhatsApp Business Account ID associated with the business phone number
    }
  ],
  "object": "whatsapp_business_account"
}

Part 4: Your business or the WhatsApp user terminates the call

Either you or the WhatsApp user can terminate the call at any time.
Use the Calls API with the following request body to terminate the call:
POST <PHONE_NUMBER_ID>/calls
{
  "messaging_product": "whatsapp",
  "call_id": "wacid.HBgLMTIxODU1NTI4MjgVAgARGCAyODRQIAFRoA", // The WhatsApp call ID
  "action" : "terminate"
}
If there are no errors, you will receive a success response:
{
  "success" : true
}
When either the business or the WhatsApp user terminates the call, you receive a Call Terminate webhook:
{
  "object": "whatsapp_business_account",
  "entry": [
    {
      "id": "366634483210360", // WhatsApp Business Account ID associated with the business phone number
      "changes": [
        {
          "value": {
            "messaging_product": "whatsapp",
            "metadata": { // ID and display number for the business phone number placing the call (caller)
              "phone_number_id": "436666719526789",
              "display_phone_number": "13175551399",

            },
            "calls": [
              {
                "id": "wacid.HBgLMTIxODU1NTI4MjgVAgARGCAyODRQIAFRoA",
                "to": "12185552828", // The WhatsApp user's phone number (callee)
                "to_user_id": "<BSUID>",
                "to_parent_user_id": "<PARENT_BSUID>",
                "from": "13175551399", // The business phone number placing the call (caller)
                "event": "terminate",
                "direction": "BUSINESS_INITIATED",
                "timestamp": "1749197480",
                "status": ["Failed", "Completed"],
                "start_time": "1671644824", // Call start UNIX timestamp
                "end_time": "1671644944", // Call end UNIX timestamp
                "duration": 480 // Call duration in seconds
              }
            ],
            "contacts": [
              {
                "profile": {
                  "name": "<CALLEE_NAME>",
                  "username": "<USERNAME>"
                },
                "wa_id": "<USER_PHONE_NUMBER>",
                "user_id": "<BSUID>",
                "parent_user_id": "<PARENT_BSUID>"
              }
            ]
          },
          "field": "calls"
        }
      ]
    }
  ]
}

Endpoints for business-initiated calling

Initiate call

Use this endpoint to initiate a call to a WhatsApp user by providing a phone number and a WebRTC call offer. There is a rate limit of 10000 per 24 hours for initiating new calls per business phone number.

Request syntax

POST <PHONE_NUMBER_ID>/calls
Placeholder Description Sample Value
<PHONE_NUMBER_ID>
Integer
Required

ID of the business phone number from which you are initiating the new call.
106540352242922

Request body

{
  "messaging_product": "whatsapp",
  "to": "14085551234",
  "recipient": "US.13491208655302741918",
  "action": "connect",
  "session": {
    "sdp_type": "offer",
    "sdp": "<<RFC 8866 SDP>>"
  },
  "biz_opaque_callback_data": "0fS5cePMok"
}

Body parameters

Parameter Description Sample Value
to
Integer
Required (unless recipient is provided)

The number being called (callee). The user can be identified by phone number (to), BSUID (recipient), or both. If you include both, to takes precedence.
Learn more about formatting phone numbers in Cloud API
Learn how business-scoped user IDs apply to business-initiated call requests
"17863476655"
recipient
String
Optional

The WhatsApp user’s business-scoped user ID (BSUID) or parent BSUID. Use this instead of, or in addition to, to. If you include both, to takes precedence.
Learn more about business-scoped user IDs
"US.13491208655302741918"
action
String
Required

The action being taken on the given call ID.
Values can be connect | pre_accept | accept | reject | terminate
"connect"
session
JSON object
Optional

Contains the session description protocol (SDP) type and description language.
Requires two values:
sdp_type — (String) Required
“offer”, to indicate SDP offer
sdp — (String) Required
The SDP info of the device on the other end of the call. The SDP must be compliant with RFC 8866⁠.
Learn more about Session Description Protocol (SDP)⁠
View example SDP structures
"session" :
{
"sdp_type" : "offer",
"sdp" : "<<RFC 8866 SDP>>"
}
biz_opaque_callback_data
String
Optional

An arbitrary string you can pass in that is useful for tracking and logging purposes.
Any app subscribed to the “calls” webhook field on your WhatsApp Business Account can receive this string, as it is included in the calls object within the subsequent Call Terminate Webhook payload.
Cloud API does not process this field.
Maximum 512 characters
"0fS5cePMok"
Usernames and business-scoped user IDs: When initiating a call, you can identify the recipient by phone number (to), BSUID (recipient), or both; the user’s phone number may be omitted if a recipient is provided. For details, see Business-scoped user IDs.

Success response

{
  "messaging_product": "whatsapp",
  "calls" : [{
     "id" : "wacid.ABGGFjFVU2AfAgo6V",
   }]
}

Error response

Possible errors that can occur:
  • Invalid phone-number-id
  • Permissions/Authorization errors
  • Request format validation errors, for example connection info, sdp, ice
  • SDP validation errors
  • Calling restriction errors
View Calling API Error Codes and Troubleshooting for more information
View general Cloud API Error Codes here

Terminate call

Use this endpoint to terminate an active call.
This must be done even if there is an RTCP BYE packet in the media path. Ending the call this way also ensures pricing is more accurate.
When the WhatsApp user terminates the call, you do not have to call this endpoint. Once the call is successfully terminated, you will receive a Call Terminate Webhook.

Request syntax

POST <PHONE_NUMBER_ID>/calls
Parameter Description Sample Value
<PHONE_NUMBER_ID>
Integer
Required

The business phone number which you are terminating a call from.
Learn more about formatting phone numbers in Cloud API
18274459827

Request body

{
  "messaging_product": "whatsapp",
  "call_id": "wacid.ABGGFjFVU2AfAgo6V-Hc5eCgK5Gh",
  "action": "terminate"
}

Body parameters

Parameter Description Sample Value
call_id
String
Required

The ID of the phone call.
For inbound calls, you receive a call ID from the Call Connect webhook when a WhatsApp user initiates the call.
"wacid.ABGGFjFVU2AfAgo6V-Hc5eCgK5Gh"
action
String
Required

The action being taken on the given call ID.
Values can be connect | pre_accept | accept | reject | terminate
"terminate"

Success response

{
  "messaging_product": "whatsapp",
  "success" : true
}

Error response

Possible errors that can occur:
  • Invalid call id
  • Invalid phone-number-id
  • The WhatsApp user has already terminated the call
  • Reject call is already in progress
  • Permissions/Authorization errors
View Calling API Error Codes and Troubleshooting for more information
View general Cloud API Error Codes here

Webhooks for business-initiated calling

With all Calling API webhooks, there is a "calls" object inside the "value" object of the webhook response. The "calls" object contains metadata about the call that is used to action on each call placed or received by your business.
To receive Calling API webhooks, subscribe to the “calls” webhook field.
Learn more about Cloud API webhooks here

Call connect webhook

You receive a webhook notification in near real-time when a call initiated by your business is ready to connect to the WhatsApp user (an SDP Answer).
Critically, the webhook contains information required to establish a call connection via WebRTC.
Once you receive the Call Connect webhook, you can apply the SDP Answer received in the webhook to your WebRTC stack to initiate the media connection.
{
  "object": "whatsapp_business_account",
  "entry": [
    {
      "id": "<WHATSAPP_BUSINESS_ACCOUNT_ID>",
      "changes": [
        {
          "value": {
            "messaging_product": "whatsapp",
            "metadata": {
              "display_phone_number": "16315553601",
              "phone_number_id": "<PHONE_NUMBER_ID>"
            },
            "contacts": [
              {
                "profile": {
                  "name": "<CALLEE_NAME>",
                  "username": "<USERNAME>"
                },
                "wa_id": "16315553602",
                "user_id": "<BSUID>",
                "parent_user_id": "<PARENT_BSUID>"
              }
            ],
            "calls": [
              {
                "id": "wacid.ABGGFjFVU2AfAgo6V-Hc5eCgK5Gh",
                "to": "16315553601",
                "to_user_id": "<BSUID>",
                "to_parent_user_id": "<PARENT_BSUID>",
                "from": "16315553602",
                "event": "connect",
                "timestamp": "1671644824",
                "direction": "BUSINESS_INITIATED",
                "session": {
                  "sdp_type": "answer",
                  "sdp": "<<RFC 8866 SDP>>"
                }
              }
            ]
          },
          "field": "calls"
        }
      ]
    }
  ]
}

Webhook values for "calls"

Placeholder Description
id
String
A unique ID for the call
to
Integer
The number being called (callee). May be omitted if the user has adopted a username and the phone number cannot be included.
to_user_id
String
The BSUID of the WhatsApp user.
to_parent_user_id
String
Optional. The parent BSUID of the WhatsApp user. Only included if parent BSUIDs are enabled.
from
Integer
The number of the caller
event
Integer
The calling event that this webhook is notifying the subscriber of
timestamp
Integer
The UNIX timestamp of the webhook event
direction
String
The direction of the call being made.
Can contain either:
BUSINESS_INITIATED, for calls initiated by your business.
USER_INITIATED, for calls initiated by a WhatsApp user.
session
JSON object
Optional

Contains the session description protocol (SDP) type and description language.
Requires two values:
sdp_type — (String) Required
“offer”, to indicate SDP offer
sdp — (String) Required
The SDP info of the device on the other end of the call. The SDP must be compliant with RFC 8866⁠.
Learn more about Session Description Protocol (SDP)⁠
View example SDP structures
contacts
JSON object
profile.name — The display name of the callee.
profile.username — Optional. The username of the user, if the user has adopted a username.
wa_id — The WhatsApp ID of the callee. May be omitted if the user has adopted a username and the phone number cannot be included.
user_id — The BSUID of the WhatsApp user.
parent_user_id — Optional. The parent BSUID of the WhatsApp user. Only included if parent BSUIDs are enabled.
Usernames and business-scoped user IDs: The Call connect webhook may include to_user_id, to_parent_user_id, and contacts fields containing the user’s BSUID and username; the user’s phone number may be omitted. For details, see Business-scoped user IDs.

Call status webhook

This webhook is sent during the following calling events:
  1. Ringing: When the WhatsApp user’s client device begins ringing
  2. Accepted: When the WhatsApp user accepts the call
  3. Rejected: When the WhatsApp user rejects the call. You also receive the call terminate webhook in this case.
The webhook structure here is similar to the Status webhooks used for the Cloud API messages.
{
  "object": "whatsapp_business_account",
  "entry": [
    {
      "id": "<WHATSAPP_BUSINESS_ACCOUNT_ID>",
      "changes": [
        {
          "value": {
              "messaging_product": "whatsapp",
              "metadata": {
                   "display_phone_number": "16315553601",
                   "phone_number_id": "<PHONE_NUMBER_ID>",
              },
              "statuses": [{
                    "id": "wacid.ABGGFjFVU2AfAgo6V",
                    "timestamp": "1671644824",
                    "type": "call"
                    "status": "[RINGING|ACCEPTED|REJECTED]",
                    "recipient_id": "163155536021",
                    "recipient_user_id": "<BSUID>",
                    "recipient_parent_user_id": "<PARENT_BSUID>",
                    "biz_opaque_callback_data": "random_string",
               }]
          },
          "field": "calls"
        }
      ]
    }
  ]
}
Learn more about Cloud API status webhooks

Webhook values for "statuses"

Placeholder Description
id
String
A unique ID for the call
timestamp
Integer
The UNIX timestamp of the webhook event
recipient_id
Integer
The phone number of the WhatsApp user receiving the call. May be omitted if the user has adopted a username and the phone number cannot be included.
recipient_user_id
String
The BSUID of the WhatsApp user.
recipient_parent_user_id
String
Optional. The parent BSUID of the WhatsApp user. Only included if parent BSUIDs are enabled.
status
Integer
The current call status.
Possible values:
RINGING: Business initiated call is ringing the user
ACCEPTED: Business initiated call is accepted by the user
REJECTED: Business initiated call is rejected by the user
biz_opaque_callback_data
String
Arbitrary string your business passes into the call for tracking and logging purposes.
Will only be returned if provided through Initiate New Call API requests
Usernames and business-scoped user IDs: The Call status webhook may include recipient_user_id and recipient_parent_user_id fields containing the user’s BSUID; the user’s phone number (recipient_id) may be omitted. For details, see Business-scoped user IDs.

Call terminate webhook

A webhook notification is sent whenever the call has been terminated for any reason, such as when the WhatsApp user hangs up, or when the business uses the Calls API with an action of terminate or reject.
{
  "object": "whatsapp_business_account",
  "entry": [
    {
      "id": "<WHATSAPP_BUSINESS_ACCOUNT_ID>",
      "changes": [
        {
          "value": {
              "messaging_product": "whatsapp",
              "metadata": {
                   "display_phone_number": "16505553602",
                   "phone_number_id": "<PHONE_NUMBER_ID>",
              },
               "calls": [
                {
                    "id": "wacid.ABGGFjFVU2AfAgo6V-Hc5eCgK5Gh",
                    "to": "16315553601",
                    "to_user_id": "<BSUID>",
                    "to_parent_user_id": "<PARENT_BSUID>",
                    "from": "16315553602",
                    "event": "terminate"
                    "direction": "BUSINESS_INITIATED",
                    "biz_opaque_callback_data": "random_string",
                    "timestamp": "1671644824",
                    "status" : [FAILED | COMPLETED],
                    "start_time" : "1671644824",
                    "end_time" : "1671644944",
                    "duration" : 120
                }
              ],
              "contacts": [
                {
                    "profile": {
                        "name": "<CALLEE_NAME>",
                        "username": "<USERNAME>"
                    },
                    "wa_id": "<USER_PHONE_NUMBER>",
                    "user_id": "<BSUID>",
                    "parent_user_id": "<PARENT_BSUID>"
                }
              ],
              "errors": [
                {
                    "code": INT_CODE,
                    "message": "ERROR_TITLE",
                    "href": "ERROR_HREF",
                    "error_data": {
                        "details": "ERROR_DETAILS"
                    }
                }
              ]
          },
          "field": "calls"
        }
      ]
    }
  ]
}

Webhook values for "calls"

Placeholder Description
id
String
A unique ID for the call
to
Integer
The number being called (callee). May be omitted if the user has adopted a username and the phone number cannot be included.
to_user_id
String
The BSUID of the WhatsApp user.
to_parent_user_id
String
Optional. The parent BSUID of the WhatsApp user. Only included if parent BSUIDs are enabled.
from
Integer
The number of the caller
event
Integer
The calling event that this webhook is notifying the subscriber of
timestamp
Integer
The UNIX timestamp of the webhook event
direction
String
The direction of the call being made.
Can contain either:
BUSINESS_INITIATED, for calls initiated by your business.
USER_INITIATED, for calls initiated by a WhatsApp user.
start_time
Integer
The UNIX timestamp of when the call started.
Only present when the call was picked up by the other party.
end_time
Integer
The UNIX timestamp of when the call ended.
Only present when the call was picked up by the other party.
duration
Integer
Duration of the call in seconds.
Only present when the call was picked up by the other party.
biz_opaque_callback_data
String
Arbitrary string your business passes into the call for tracking and logging purposes.
Will only be returned if provided through an Initiate Call API request or Accept Call request
errors.code
Integer
The errors object is present only for failed calls when there is error information available. Code is one of the calling error codes
contacts
JSON object
profile.name — The display name of the callee.
profile.username — Optional. The username of the user, if the user has adopted a username.
wa_id — The WhatsApp ID of the callee. May be omitted if the user has adopted a username and the phone number cannot be included.
user_id — The BSUID of the WhatsApp user.
parent_user_id — Optional. The parent BSUID of the WhatsApp user. Only included if parent BSUIDs are enabled.
Usernames and business-scoped user IDs: The Call terminate webhook may include to_user_id, to_parent_user_id, and contacts fields containing the user’s BSUID and username; the user’s phone number may be omitted. For details, see Business-scoped user IDs.

SDP overview and sample structures

Session Description Protocol (SDP) is a text-based format used to describe the characteristics of multimedia sessions, such as voice and video calls, in real-time communication applications. SDP provides a standardized way to describe the session’s media streams. This includes media type, codecs, protocols, and parameters for establishing and managing the session.
In the context of WebRTC, SDP is used to negotiate the media parameters between the sender and receiver, enabling them to agree on the specifics of the media exchange.
View SDP sample structures for business-initiated calls