> ## Documentation Index > Fetch the complete documentation index at: https://whatsapp-docs.kap.so/llms.txt > Use this file to discover all available pages before exploring further. # Business initiated calls # Business-initiated calls ## 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](https://developers.facebook.com/docs/whatsapp/cloud-api/calling/user-call-permissions). ### Call sequence diagram ![](https://lookaside.fbsbx.com/elementpath/media/?media_id=1080278697331057\&version=1750265314\&transcode_extension=webp) ( *Right click image and choose "Open in new tab" for enlarged image*) *Note: The `ACCEPTED` call status webhook will typically always arrive after the call has been established. It is primarily sent for call event auditing.* ## Prerequisites Before you get started with business-initiated calling, ensure that: * [Subscribe](https://developers.facebook.com/docs/whatsapp/webhooks/create-webhook-endpoint#configure-webhooks) to the "calls" webhook field * [Calling APIs are enabled on your business phone number](https://developers.facebook.com/docs/whatsapp/cloud-api/calling/call-settings) 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](https://developers.facebook.com/docs/whatsapp/cloud-api/calling/user-call-permissions) ## Business-initiated calling flow ### Part 1: Obtain permission to call the WhatsApp user Obtaining call permissions from the WhatsApp user can be done 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, either as a free form message during an open customer service window, or by using a template message that contains the request. * [Learn how to send a **free form** call permission request](https://developers.facebook.com/docs/whatsapp/cloud-api/calling/user-call-permissions#how-to-send-a-free-form-call-permission-request-message) * [Learn how to send a **template** call permission request](https://developers.facebook.com/docs/whatsapp/cloud-api/calling/user-call-permissions#how-to-create-and-send-call-permission-request-template-messages) #### 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`](https://developers.facebook.com/docs/whatsapp/cloud-api/calling/call-settings#configure-update-business-phone-number-calling-settings) #### 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. You can now call the `POST <PHONE_NUMBER_ID>/calls` endpoint with the following request body to initiate a new call: ```https theme={null} POST <PHONE_NUMBER_ID>/calls \{ "messaging_product": "whatsapp", "to":"12185552828", // The WhatsApp user's phone number (callee) "action":"connect", "session" : { "sdp_type" : "offer", "sdp" : "<>" } } ``` If there are no errors, you will receive a successful response: ```https theme={null} \{ "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 successful initiation of a new call, you will receive a Call Connect webhook response that contains an `SDP Answer` from Cloud API. Your business will then apply the `SDP Answer` from this webhook to your WebRTC stack in order to initiate the media connection. ```https theme={null} \{ "entry": [\ {\ "changes": [\ {\ "field": "calls",\ "value": {\ "calls": [\ {\ "biz_opaque_callback_data": "TRx334DUDFTI4Mj", // Arbitrary string passed by business for tracking purposes\ "session": {\ "sdp_type": "answer",\ "sdp": ""\ },\ "from": "13175551399", // The business phone number placing the call (caller)\ "connection": {\ "webrtc": {\ "sdp": ""\ }\ },\ "id": "wacid.HBgLMTIxODU1NTI4MjgVAgARGCAyODRQIAFRoA", // The WhatsApp call ID\ "to": "12185552828", // The WhatsApp user's phone number (callee)\ "event": "connect",\ "timestamp": "1749196895",\ "direction": "BUSINESS_INITIATED"\ }\ ],\ "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`: ```https theme={null} \{ "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)\ }\ ],\ "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 Both you or the WhatsApp user can terminate the call at any time. You call the `POST <PHONE_NUMBER_ID>/calls` endpoint with the following request body to terminate the call: ```curl theme={null} 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: ```https theme={null} \{ "success" : true } ``` When either the business or the WhatsApp user terminates the call, you receive a Call Terminate webhook: ```https theme={null} \{ "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)\ "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\ }\ ]\ },\ "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. #### Request Syntax ```https theme={null} POST <PHONE_NUMBER_ID>/calls ``` | Placeholder | Description | Sample Value | | ---------------------------------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | -------------- | | `<PHONE_NUMBER_ID>`
*Integer* | **Required**
The business phone number from which you are initiating a new call from.
[Learn more about formatting phone numbers in Cloud API](https://developers.facebook.com/docs/whatsapp/cloud-api/reference/phone-numbers#whatsapp-user-phone-number-formats) | `+12784358810` | #### Request body ```https theme={null} \{ "messaging_product": "whatsapp", "to": "14085551234", "action": "connect", "session": { "sdp_type": "offer", "sdp": "<>" }, "biz_opaque_callback_data": "0fS5cePMok" } ``` #### Body parameters | Parameter | Description | Sample Value | | ---------------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ | -------------------------------------------------------------------------------------------------------- | | `to`
*Integer* | **Required**
The number being called (callee) | `“17863476655”` | | `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](https://l.facebook.com/l.php?u=https%3A%2F%2Fdatatracker.ietf.org%2Fdoc%2Fhtml%2Frfc8866\&h=AT2bPVFep13Lh0nojIYGyHuIEaXzCP-u8GNEaZV8GCh9ZCzH7lgYzWfC-i0jgUfePOZKFvJY1gcgohC6CcSaCVrHqmhzhaGNADIi0aYGuFfhu1GGFAGIgNhg8EsvaW22MorXQUybtqhM1A).
[Learn more about Session Description Protocol (SDP)](https://l.facebook.com/l.php?u=https%3A%2F%2Fwww.rfc-editor.org%2Frfc%2Frfc8866.html\&h=AT1EUhjTZeDFKK09FUfUzad6b_5U4iYrI-Pjt6sQ_3f9kAiHKFNz1Nn92_HqDSXWSuiY1Vng0xuPhC2ayZeG_R7zuhK4CTNygAtZtbhTUY5Sg4vdmKRFUvnSAfukXHPvNPMYZpTKygz--A)
[View example SDP structures](https://developers.facebook.com/docs/whatsapp/cloud-api/calling/reference#sdp-overview-and-sample-sdp-structures) | `https
"session" :
{
"sdp_type" : "offer",
"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](https://developers.facebook.com/docs/whatsapp/cloud-api/calling/business-initiated-calls#call-terminate-webhook) payload.
Cloud API does not process this field.
Maximum 512 characters | `“0fS5cePMok”` | #### Success response ```https theme={null} \{ "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, e.g. connection info, sdp, ice * SDP validation errors * Calling restriction errors [View Calling API Error Codes and Troubleshooting for more information](https://developers.facebook.com/docs/whatsapp/cloud-api/calling/troubleshooting) [View general Cloud API Error Codes here](https://developers.facebook.com/docs/whatsapp/cloud-api/support/error-codes) ### 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, a [Call Terminate Webhook](https://developers.facebook.com/docs/whatsapp/cloud-api/calling/business-initiated-calls#call-terminate-webhook) will be sent to you. #### Request syntax ```https theme={null} POST *Integer* | **Required**
The business phone number which you are terminating a call from.
[Learn more about formatting phone numbers in Cloud API](https://developers.facebook.com/docs/whatsapp/cloud-api/reference/phone-numbers#whatsapp-user-phone-number-formats) | `18274459827` | #### Request body ```https theme={null} \{ "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](https://developers.facebook.com/docs/whatsapp/cloud-api/calling/business-initiated-calls#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 ```https theme={null} \{ "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](https://developers.facebook.com/docs/whatsapp/cloud-api/calling/troubleshooting) [View general Cloud API Error Codes here](https://developers.facebook.com/docs/whatsapp/cloud-api/support/error-codes) ## 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](https://developers.facebook.com/docs/whatsapp/cloud-api/webhooks/components#statuses-object) ### Call connect webhook A webhook notification is sent in near real-time when a call initiated by your business is ready to be connected 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 in order to initiate the media connection. ```https theme={null} \{ "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>"\ },\ "wa_id": "16315553602"\ }\ ],\ "calls": [\ {\ "id": "wacid.ABGGFjFVU2AfAgo6V-Hc5eCgK5Gh",\ "to": "16315553601",\ "from": "16315553602",\ "event": "connect",\ "timestamp": "1671644824",\ "direction": "BUSINESS_INITIATED",\ "session": {\ "sdp_type": "answer",\ "sdp": "<>"\ }\ }\ ]\ },\ "field": "calls"\ }\ ]\ }\ ] } ``` #### Webhook values for `"calls"` | Placeholder | Description | | ----------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ | | `id`
*String* | A unique ID for the call | | `to`
*Integer* | The number being called (callee) | | `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](https://l.facebook.com/l.php?u=https%3A%2F%2Fdatatracker.ietf.org%2Fdoc%2Fhtml%2Frfc8866\&h=AT2Z-d47cK6onflqkVETSHEvWH6Ra0ZSUUnUzni5gE4pwEIzb5qP4NtmN5aE4B4rMUDsqoujGQRvLWY2emYvcNEmlhyCARu0rvrhXBvrc7R8C6f-uCgZJUof7Y5SJ3gDEAofOvdP-1kIKg).
[Learn more about Session Description Protocol (SDP)](https://l.facebook.com/l.php?u=https%3A%2F%2Fwww.rfc-editor.org%2Frfc%2Frfc8866.html\&h=AT3KYf20aDEbt6_qvHrgCGi4hUFzHupgxHcJAzkRYP_QjKlJRIyOxIHt7ulUXtVR8o0ZTM-BmmJic5_pCZCtYYyTFzYgJx8GdiGfNQW3EsZR71FW4vkxqzfc_Rlsdl7ygUH_8MYDiV8_OQ)
[View example SDP structures](https://developers.facebook.com/docs/whatsapp/cloud-api/calling/reference#sdp-overview-and-sample-sdp-structures) | | `contacts`
*JSON object* | Profile information of the callee.
Contains two values:
`name` — The WhatsApp profile name of the callee.
`wa_id` — The WhatsApp ID of the callee. | ### 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 call is rejected by the WhatsApp user. You'll 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. ```https theme={null} \{ "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",\ "biz_opaque_callback_data": "random_string",\ }]\ },\ "field": "calls"\ }\ ]\ }\ ] } ``` [*Learn more about Cloud API status webhooks*](https://developers.facebook.com/docs/whatsapp/cloud-api/webhooks/components#statuses-object) #### 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 | | `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_date`
*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](https://developers.facebook.com/docs/whatsapp/cloud-api/calling/business-initiated-calls#initiate-a-new-call) | ### 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 calls the `POST /<PHONE_NUMBER_ID>/calls` endpoint with an action of `terminate` or `reject`. ```https theme={null} \{ "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",\ "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\ }\ ],\ "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) | | `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_date`
*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](https://developers.facebook.com/docs/whatsapp/cloud-api/calling/business-initiated-calls#initiate-call) or [Accept Call request](https://developers.facebook.com/docs/whatsapp/cloud-api/calling/reference#accept-call) | | `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](https://developers.facebook.com/docs/whatsapp/cloud-api/calling/troubleshooting#calling-error-codes) | ## SDP overview and sample SDP 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 convey information about the session's media streams, including the type of media, codecs, protocols, and other parameters necessary 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](https://developers.facebook.com/docs/whatsapp/cloud-api/calling/reference#sdp-overview-and-sample-sdp-structures) On This Page [Business-initiated calls](https://developers.facebook.com/docs/whatsapp/cloud-api/calling/business-initiated-calls#business-initiated-calls) [Overview](https://developers.facebook.com/docs/whatsapp/cloud-api/calling/business-initiated-calls#overview) [Call sequence diagram](https://developers.facebook.com/docs/whatsapp/cloud-api/calling/business-initiated-calls#call-sequence-diagram) [Prerequisites](https://developers.facebook.com/docs/whatsapp/cloud-api/calling/business-initiated-calls#prerequisites) [Business-initiated calling flow](https://developers.facebook.com/docs/whatsapp/cloud-api/calling/business-initiated-calls#business-initiated-calling-flow) [Part 1: Obtain permission to call the WhatsApp user](https://developers.facebook.com/docs/whatsapp/cloud-api/calling/business-initiated-calls#part-1--obtain-permission-to-call-the-whatsapp-user) [Part 2: Your business initiates a new call to the WhatsApp user](https://developers.facebook.com/docs/whatsapp/cloud-api/calling/business-initiated-calls#part-2--your-business-initiates-a-new-call-to-the-whatsapp-user) [Part 3: You establish the call connection using webhook signaling](https://developers.facebook.com/docs/whatsapp/cloud-api/calling/business-initiated-calls#part-3--you-establish-the-call-connection-using-webhook-signaling) [Part 4: Your business or the WhatsApp user terminates the call](https://developers.facebook.com/docs/whatsapp/cloud-api/calling/business-initiated-calls#part-4--your-business-or-the-whatsapp-user-terminates-the-call) [Endpoints for business-initiated calling](https://developers.facebook.com/docs/whatsapp/cloud-api/calling/business-initiated-calls#endpoints-for-business-initiated-calling) [Initiate call](https://developers.facebook.com/docs/whatsapp/cloud-api/calling/business-initiated-calls#initiate-call) [Terminate call](https://developers.facebook.com/docs/whatsapp/cloud-api/calling/business-initiated-calls#terminate-call) [Webhooks for business-initiated calling](https://developers.facebook.com/docs/whatsapp/cloud-api/calling/business-initiated-calls#webhooks-for-business-initiated-calling) [Call connect webhook](https://developers.facebook.com/docs/whatsapp/cloud-api/calling/business-initiated-calls#call-connect-webhook) [Call status webhook](https://developers.facebook.com/docs/whatsapp/cloud-api/calling/business-initiated-calls#call-status-webhook) [Call terminate webhook](https://developers.facebook.com/docs/whatsapp/cloud-api/calling/business-initiated-calls#call-terminate-webhook) [SDP overview and sample SDP structures](https://developers.facebook.com/docs/whatsapp/cloud-api/calling/business-initiated-calls#sdp-overview-and-sample-sdp-structures)