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# Accept a transfer offer

POST https://api.talkif.ai/api/v1/transfers/offers/{offerId}/accept
Content-Type: application/json

The first accept wins; accept before `acceptUntil`. Without a body the
reply carries a single-use WebSocket `joinUrl` for the call's audio; with
`{"sdpOffer": "<SDP>"}` the call joins over WebRTC and the reply carries
the SDP answer and ICE servers. Join within 10 seconds (20 for WebRTC) or
the offer counts as unanswered. Requires an API key with the
`transfer_offers:write` scope; repeating the accept with the same key
returns a new join.

Reference: https://docs.talkif.ai/api-reference/transfers/accept-offer

## Authentication

- `Authorization` header (bearer token, required) — Pass a JWT access token or an API key (prefixed with `tif_live_`) as a Bearer token.

## Request

### Path parameters

- `offerId` (string, required) — Offer ID

### Body (application/json)

This endpoint expects an AcceptTransferOfferRequest.

- `clientId` (string, optional, nullable) — Identifier of the accepting client (at most 64 characters)
- `sdpOffer` (string, optional, nullable) — WebRTC SDP offer; present = join over WebRTC, absent = WebSocket join

## Response

### 200

Accepted; how to join the call

- `TransferOfferAcceptResponse`

## Errors

### 401 Unauthorized Error

Authentication required — token is missing, expired, or invalid

- `code` (enum, required) — Machine-readable error code for programmatic handling
  - Allowed values: `invalid_credentials`, `email_already_exists`, `phone_already_exists`, `contact_phone_already_exists`, `account_suspended`, `account_access_denied`, `token_expired`, `token_invalid`, `token_missing`, `account_header_missing`, `refresh_token_invalid`, `email_already_verified`, `email_verification_code_invalid`, `email_verification_code_expired`, `email_verification_code_used`, `email_service_unavailable`, `phone_already_verified`, `phone_verification_code_invalid`, `phone_verification_code_expired`, `phone_verification_code_used`, `phone_number_missing`, `sms_service_unavailable`, `mfa_already_enabled`, `mfa_not_enabled`, `mfa_not_setup`, `mfa_code_invalid`, `password_reset_token_invalid`, `password_reset_token_expired`, `password_reset_token_used`, `password_current_incorrect`, `password_same_as_current`, `invalid_o_auth_state`, `o_auth_provider_error`, `o_auth_already_linked`, `provider_already_connected`, `o_auth_not_linked`, `cannot_unlink_only_auth`, `validation_failed`, `bad_request`, `invalid_json`, `resource_not_found`, `not_found`, `forbidden`, `insufficient_permissions`, `conflict`, `resource_already_exists`, `insufficient_balance`, `payment_required`, `subscription_required`, `feature_not_available`, `payment_failed`, `business_rule_violation`, `invalid_state_transition`, `unprocessable_entity`, `rate_limit_exceeded`, `queue_full`, `assistant_quota_exceeded`, `user_phone_not_verified`, `account_not_verified`, `payment_method_required`, `trial_already_claimed`, `promotion_not_eligible`, `coupon_not_found`, `coupon_not_redeemable`, `coupon_already_redeemed`, `phone_number_not_active`, `phone_number_not_verified`, `phone_number_cannot_initiate_calls`, `flow_not_published`, `provider_call_rejected`, `concurrent_call_limit_exceeded`, `daily_call_limit_exceeded`, `contact_on_dnc_list`, `outside_callable_hours`, `call_already_completed`, `phone_provider_not_active`, `phone_number_already_connected`, `phone_number_not_connected`, `provider_must_be_sip`, `verification_only_for_sip`, `phone_verification_not_started`, `twilio_credentials_required`, `byoc_only`, `phone_already_registered`, `cannot_delete_system_provider`, `flow_name_already_exists`, `flow_structure_invalid`, `flow_has_connected_phones`, `flow_version_invalid`, `flow_version_conflict`, `flow_function_name_exists`, `flow_function_not_found`, `flow_generation_failed`, `payment_method_card_only`, `template_variable_resolution_failed`, `phone_number_in_use`, `mfa_token_invalid`, `invalid_id_format`, `verification_code_invalid`, `cannot_delete_has_dependencies`, `in_use`, `unsupported_kind`, `offer_taken`, `offer_taken_self`, `offer_expired`, `already_taken`, `takeover_unsupported`, `schedule_not_found`, `schedule_already_paused`, `schedule_not_paused`, `invalid_cron_expression`, `invalid_timezone`, `campaign_not_found`, `campaign_not_draft`, `campaign_no_contacts`, `legal_acceptance_required`, `invitation_not_found`, `invitation_not_pending`, `invitation_expired`, `not_invitation_recipient`, `organization_suspended`, `already_organization_member`, `api_key_invalid`, `api_key_expired`, `api_key_revoked`, `api_key_not_allowed`, `api_key_insufficient_scope`, `api_key_ip_restricted`, `api_key_limit_reached`, `internal_error`, `service_error`, `service_unavailable`, `no_bots_available`, `region_saturated`, `recording_not_available`, `recording_service_not_configured`, `meta_not_configured`, `meta_page_already_connected`, `meta_form_already_mapped`, `meta_api_error`, `meta_lead_unrecoverable`, `unauthorized`
- `detail` (string, required) — Human-readable detail message for this specific error instance
- `status` (integer, required) — HTTP status code (mirrors the response status line)
- `title` (string, required) — Human-readable title for the error category
- `errors` (list of FieldError, optional, nullable) — Field-level validation errors, present when code is `validation_failed`
- `meta` (ErrorResponseMeta, optional, nullable) — Additional context metadata (e.g., retryAfterSecs for rate limits)
- `requestId` (string, optional, nullable) — Unique request identifier for debugging (also in X-Request-Id response header)

### 403 Forbidden Error

Not an API key, or the key lacks the `transfer_offers` scope

- `code` (enum, required) — Machine-readable error code for programmatic handling
  - Allowed values: `invalid_credentials`, `email_already_exists`, `phone_already_exists`, `contact_phone_already_exists`, `account_suspended`, `account_access_denied`, `token_expired`, `token_invalid`, `token_missing`, `account_header_missing`, `refresh_token_invalid`, `email_already_verified`, `email_verification_code_invalid`, `email_verification_code_expired`, `email_verification_code_used`, `email_service_unavailable`, `phone_already_verified`, `phone_verification_code_invalid`, `phone_verification_code_expired`, `phone_verification_code_used`, `phone_number_missing`, `sms_service_unavailable`, `mfa_already_enabled`, `mfa_not_enabled`, `mfa_not_setup`, `mfa_code_invalid`, `password_reset_token_invalid`, `password_reset_token_expired`, `password_reset_token_used`, `password_current_incorrect`, `password_same_as_current`, `invalid_o_auth_state`, `o_auth_provider_error`, `o_auth_already_linked`, `provider_already_connected`, `o_auth_not_linked`, `cannot_unlink_only_auth`, `validation_failed`, `bad_request`, `invalid_json`, `resource_not_found`, `not_found`, `forbidden`, `insufficient_permissions`, `conflict`, `resource_already_exists`, `insufficient_balance`, `payment_required`, `subscription_required`, `feature_not_available`, `payment_failed`, `business_rule_violation`, `invalid_state_transition`, `unprocessable_entity`, `rate_limit_exceeded`, `queue_full`, `assistant_quota_exceeded`, `user_phone_not_verified`, `account_not_verified`, `payment_method_required`, `trial_already_claimed`, `promotion_not_eligible`, `coupon_not_found`, `coupon_not_redeemable`, `coupon_already_redeemed`, `phone_number_not_active`, `phone_number_not_verified`, `phone_number_cannot_initiate_calls`, `flow_not_published`, `provider_call_rejected`, `concurrent_call_limit_exceeded`, `daily_call_limit_exceeded`, `contact_on_dnc_list`, `outside_callable_hours`, `call_already_completed`, `phone_provider_not_active`, `phone_number_already_connected`, `phone_number_not_connected`, `provider_must_be_sip`, `verification_only_for_sip`, `phone_verification_not_started`, `twilio_credentials_required`, `byoc_only`, `phone_already_registered`, `cannot_delete_system_provider`, `flow_name_already_exists`, `flow_structure_invalid`, `flow_has_connected_phones`, `flow_version_invalid`, `flow_version_conflict`, `flow_function_name_exists`, `flow_function_not_found`, `flow_generation_failed`, `payment_method_card_only`, `template_variable_resolution_failed`, `phone_number_in_use`, `mfa_token_invalid`, `invalid_id_format`, `verification_code_invalid`, `cannot_delete_has_dependencies`, `in_use`, `unsupported_kind`, `offer_taken`, `offer_taken_self`, `offer_expired`, `already_taken`, `takeover_unsupported`, `schedule_not_found`, `schedule_already_paused`, `schedule_not_paused`, `invalid_cron_expression`, `invalid_timezone`, `campaign_not_found`, `campaign_not_draft`, `campaign_no_contacts`, `legal_acceptance_required`, `invitation_not_found`, `invitation_not_pending`, `invitation_expired`, `not_invitation_recipient`, `organization_suspended`, `already_organization_member`, `api_key_invalid`, `api_key_expired`, `api_key_revoked`, `api_key_not_allowed`, `api_key_insufficient_scope`, `api_key_ip_restricted`, `api_key_limit_reached`, `internal_error`, `service_error`, `service_unavailable`, `no_bots_available`, `region_saturated`, `recording_not_available`, `recording_service_not_configured`, `meta_not_configured`, `meta_page_already_connected`, `meta_form_already_mapped`, `meta_api_error`, `meta_lead_unrecoverable`, `unauthorized`
- `detail` (string, required) — Human-readable detail message for this specific error instance
- `status` (integer, required) — HTTP status code (mirrors the response status line)
- `title` (string, required) — Human-readable title for the error category
- `errors` (list of FieldError, optional, nullable) — Field-level validation errors, present when code is `validation_failed`
- `meta` (ErrorResponseMeta, optional, nullable) — Additional context metadata (e.g., retryAfterSecs for rate limits)
- `requestId` (string, optional, nullable) — Unique request identifier for debugging (also in X-Request-Id response header)

### 404 Not Found Error

Not found

- `code` (enum, required) — Machine-readable error code for programmatic handling
  - Allowed values: `invalid_credentials`, `email_already_exists`, `phone_already_exists`, `contact_phone_already_exists`, `account_suspended`, `account_access_denied`, `token_expired`, `token_invalid`, `token_missing`, `account_header_missing`, `refresh_token_invalid`, `email_already_verified`, `email_verification_code_invalid`, `email_verification_code_expired`, `email_verification_code_used`, `email_service_unavailable`, `phone_already_verified`, `phone_verification_code_invalid`, `phone_verification_code_expired`, `phone_verification_code_used`, `phone_number_missing`, `sms_service_unavailable`, `mfa_already_enabled`, `mfa_not_enabled`, `mfa_not_setup`, `mfa_code_invalid`, `password_reset_token_invalid`, `password_reset_token_expired`, `password_reset_token_used`, `password_current_incorrect`, `password_same_as_current`, `invalid_o_auth_state`, `o_auth_provider_error`, `o_auth_already_linked`, `provider_already_connected`, `o_auth_not_linked`, `cannot_unlink_only_auth`, `validation_failed`, `bad_request`, `invalid_json`, `resource_not_found`, `not_found`, `forbidden`, `insufficient_permissions`, `conflict`, `resource_already_exists`, `insufficient_balance`, `payment_required`, `subscription_required`, `feature_not_available`, `payment_failed`, `business_rule_violation`, `invalid_state_transition`, `unprocessable_entity`, `rate_limit_exceeded`, `queue_full`, `assistant_quota_exceeded`, `user_phone_not_verified`, `account_not_verified`, `payment_method_required`, `trial_already_claimed`, `promotion_not_eligible`, `coupon_not_found`, `coupon_not_redeemable`, `coupon_already_redeemed`, `phone_number_not_active`, `phone_number_not_verified`, `phone_number_cannot_initiate_calls`, `flow_not_published`, `provider_call_rejected`, `concurrent_call_limit_exceeded`, `daily_call_limit_exceeded`, `contact_on_dnc_list`, `outside_callable_hours`, `call_already_completed`, `phone_provider_not_active`, `phone_number_already_connected`, `phone_number_not_connected`, `provider_must_be_sip`, `verification_only_for_sip`, `phone_verification_not_started`, `twilio_credentials_required`, `byoc_only`, `phone_already_registered`, `cannot_delete_system_provider`, `flow_name_already_exists`, `flow_structure_invalid`, `flow_has_connected_phones`, `flow_version_invalid`, `flow_version_conflict`, `flow_function_name_exists`, `flow_function_not_found`, `flow_generation_failed`, `payment_method_card_only`, `template_variable_resolution_failed`, `phone_number_in_use`, `mfa_token_invalid`, `invalid_id_format`, `verification_code_invalid`, `cannot_delete_has_dependencies`, `in_use`, `unsupported_kind`, `offer_taken`, `offer_taken_self`, `offer_expired`, `already_taken`, `takeover_unsupported`, `schedule_not_found`, `schedule_already_paused`, `schedule_not_paused`, `invalid_cron_expression`, `invalid_timezone`, `campaign_not_found`, `campaign_not_draft`, `campaign_no_contacts`, `legal_acceptance_required`, `invitation_not_found`, `invitation_not_pending`, `invitation_expired`, `not_invitation_recipient`, `organization_suspended`, `already_organization_member`, `api_key_invalid`, `api_key_expired`, `api_key_revoked`, `api_key_not_allowed`, `api_key_insufficient_scope`, `api_key_ip_restricted`, `api_key_limit_reached`, `internal_error`, `service_error`, `service_unavailable`, `no_bots_available`, `region_saturated`, `recording_not_available`, `recording_service_not_configured`, `meta_not_configured`, `meta_page_already_connected`, `meta_form_already_mapped`, `meta_api_error`, `meta_lead_unrecoverable`, `unauthorized`
- `detail` (string, required) — Human-readable detail message for this specific error instance
- `status` (integer, required) — HTTP status code (mirrors the response status line)
- `title` (string, required) — Human-readable title for the error category
- `errors` (list of FieldError, optional, nullable) — Field-level validation errors, present when code is `validation_failed`
- `meta` (ErrorResponseMeta, optional, nullable) — Additional context metadata (e.g., retryAfterSecs for rate limits)
- `requestId` (string, optional, nullable) — Unique request identifier for debugging (also in X-Request-Id response header)

### 409 Conflict Error

`offer_taken` (accepted elsewhere) or `offer_expired` (no longer ringing, declined, or the destination was disabled or deleted)

- `code` (enum, required) — Machine-readable error code for programmatic handling
  - Allowed values: `invalid_credentials`, `email_already_exists`, `phone_already_exists`, `contact_phone_already_exists`, `account_suspended`, `account_access_denied`, `token_expired`, `token_invalid`, `token_missing`, `account_header_missing`, `refresh_token_invalid`, `email_already_verified`, `email_verification_code_invalid`, `email_verification_code_expired`, `email_verification_code_used`, `email_service_unavailable`, `phone_already_verified`, `phone_verification_code_invalid`, `phone_verification_code_expired`, `phone_verification_code_used`, `phone_number_missing`, `sms_service_unavailable`, `mfa_already_enabled`, `mfa_not_enabled`, `mfa_not_setup`, `mfa_code_invalid`, `password_reset_token_invalid`, `password_reset_token_expired`, `password_reset_token_used`, `password_current_incorrect`, `password_same_as_current`, `invalid_o_auth_state`, `o_auth_provider_error`, `o_auth_already_linked`, `provider_already_connected`, `o_auth_not_linked`, `cannot_unlink_only_auth`, `validation_failed`, `bad_request`, `invalid_json`, `resource_not_found`, `not_found`, `forbidden`, `insufficient_permissions`, `conflict`, `resource_already_exists`, `insufficient_balance`, `payment_required`, `subscription_required`, `feature_not_available`, `payment_failed`, `business_rule_violation`, `invalid_state_transition`, `unprocessable_entity`, `rate_limit_exceeded`, `queue_full`, `assistant_quota_exceeded`, `user_phone_not_verified`, `account_not_verified`, `payment_method_required`, `trial_already_claimed`, `promotion_not_eligible`, `coupon_not_found`, `coupon_not_redeemable`, `coupon_already_redeemed`, `phone_number_not_active`, `phone_number_not_verified`, `phone_number_cannot_initiate_calls`, `flow_not_published`, `provider_call_rejected`, `concurrent_call_limit_exceeded`, `daily_call_limit_exceeded`, `contact_on_dnc_list`, `outside_callable_hours`, `call_already_completed`, `phone_provider_not_active`, `phone_number_already_connected`, `phone_number_not_connected`, `provider_must_be_sip`, `verification_only_for_sip`, `phone_verification_not_started`, `twilio_credentials_required`, `byoc_only`, `phone_already_registered`, `cannot_delete_system_provider`, `flow_name_already_exists`, `flow_structure_invalid`, `flow_has_connected_phones`, `flow_version_invalid`, `flow_version_conflict`, `flow_function_name_exists`, `flow_function_not_found`, `flow_generation_failed`, `payment_method_card_only`, `template_variable_resolution_failed`, `phone_number_in_use`, `mfa_token_invalid`, `invalid_id_format`, `verification_code_invalid`, `cannot_delete_has_dependencies`, `in_use`, `unsupported_kind`, `offer_taken`, `offer_taken_self`, `offer_expired`, `already_taken`, `takeover_unsupported`, `schedule_not_found`, `schedule_already_paused`, `schedule_not_paused`, `invalid_cron_expression`, `invalid_timezone`, `campaign_not_found`, `campaign_not_draft`, `campaign_no_contacts`, `legal_acceptance_required`, `invitation_not_found`, `invitation_not_pending`, `invitation_expired`, `not_invitation_recipient`, `organization_suspended`, `already_organization_member`, `api_key_invalid`, `api_key_expired`, `api_key_revoked`, `api_key_not_allowed`, `api_key_insufficient_scope`, `api_key_ip_restricted`, `api_key_limit_reached`, `internal_error`, `service_error`, `service_unavailable`, `no_bots_available`, `region_saturated`, `recording_not_available`, `recording_service_not_configured`, `meta_not_configured`, `meta_page_already_connected`, `meta_form_already_mapped`, `meta_api_error`, `meta_lead_unrecoverable`, `unauthorized`
- `detail` (string, required) — Human-readable detail message for this specific error instance
- `status` (integer, required) — HTTP status code (mirrors the response status line)
- `title` (string, required) — Human-readable title for the error category
- `errors` (list of FieldError, optional, nullable) — Field-level validation errors, present when code is `validation_failed`
- `meta` (ErrorResponseMeta, optional, nullable) — Additional context metadata (e.g., retryAfterSecs for rate limits)
- `requestId` (string, optional, nullable) — Unique request identifier for debugging (also in X-Request-Id response header)

### 422 Unprocessable Entity Error

`invalid_sdp_offer`

- `code` (enum, required) — Machine-readable error code for programmatic handling
  - Allowed values: `invalid_credentials`, `email_already_exists`, `phone_already_exists`, `contact_phone_already_exists`, `account_suspended`, `account_access_denied`, `token_expired`, `token_invalid`, `token_missing`, `account_header_missing`, `refresh_token_invalid`, `email_already_verified`, `email_verification_code_invalid`, `email_verification_code_expired`, `email_verification_code_used`, `email_service_unavailable`, `phone_already_verified`, `phone_verification_code_invalid`, `phone_verification_code_expired`, `phone_verification_code_used`, `phone_number_missing`, `sms_service_unavailable`, `mfa_already_enabled`, `mfa_not_enabled`, `mfa_not_setup`, `mfa_code_invalid`, `password_reset_token_invalid`, `password_reset_token_expired`, `password_reset_token_used`, `password_current_incorrect`, `password_same_as_current`, `invalid_o_auth_state`, `o_auth_provider_error`, `o_auth_already_linked`, `provider_already_connected`, `o_auth_not_linked`, `cannot_unlink_only_auth`, `validation_failed`, `bad_request`, `invalid_json`, `resource_not_found`, `not_found`, `forbidden`, `insufficient_permissions`, `conflict`, `resource_already_exists`, `insufficient_balance`, `payment_required`, `subscription_required`, `feature_not_available`, `payment_failed`, `business_rule_violation`, `invalid_state_transition`, `unprocessable_entity`, `rate_limit_exceeded`, `queue_full`, `assistant_quota_exceeded`, `user_phone_not_verified`, `account_not_verified`, `payment_method_required`, `trial_already_claimed`, `promotion_not_eligible`, `coupon_not_found`, `coupon_not_redeemable`, `coupon_already_redeemed`, `phone_number_not_active`, `phone_number_not_verified`, `phone_number_cannot_initiate_calls`, `flow_not_published`, `provider_call_rejected`, `concurrent_call_limit_exceeded`, `daily_call_limit_exceeded`, `contact_on_dnc_list`, `outside_callable_hours`, `call_already_completed`, `phone_provider_not_active`, `phone_number_already_connected`, `phone_number_not_connected`, `provider_must_be_sip`, `verification_only_for_sip`, `phone_verification_not_started`, `twilio_credentials_required`, `byoc_only`, `phone_already_registered`, `cannot_delete_system_provider`, `flow_name_already_exists`, `flow_structure_invalid`, `flow_has_connected_phones`, `flow_version_invalid`, `flow_version_conflict`, `flow_function_name_exists`, `flow_function_not_found`, `flow_generation_failed`, `payment_method_card_only`, `template_variable_resolution_failed`, `phone_number_in_use`, `mfa_token_invalid`, `invalid_id_format`, `verification_code_invalid`, `cannot_delete_has_dependencies`, `in_use`, `unsupported_kind`, `offer_taken`, `offer_taken_self`, `offer_expired`, `already_taken`, `takeover_unsupported`, `schedule_not_found`, `schedule_already_paused`, `schedule_not_paused`, `invalid_cron_expression`, `invalid_timezone`, `campaign_not_found`, `campaign_not_draft`, `campaign_no_contacts`, `legal_acceptance_required`, `invitation_not_found`, `invitation_not_pending`, `invitation_expired`, `not_invitation_recipient`, `organization_suspended`, `already_organization_member`, `api_key_invalid`, `api_key_expired`, `api_key_revoked`, `api_key_not_allowed`, `api_key_insufficient_scope`, `api_key_ip_restricted`, `api_key_limit_reached`, `internal_error`, `service_error`, `service_unavailable`, `no_bots_available`, `region_saturated`, `recording_not_available`, `recording_service_not_configured`, `meta_not_configured`, `meta_page_already_connected`, `meta_form_already_mapped`, `meta_api_error`, `meta_lead_unrecoverable`, `unauthorized`
- `detail` (string, required) — Human-readable detail message for this specific error instance
- `status` (integer, required) — HTTP status code (mirrors the response status line)
- `title` (string, required) — Human-readable title for the error category
- `errors` (list of FieldError, optional, nullable) — Field-level validation errors, present when code is `validation_failed`
- `meta` (ErrorResponseMeta, optional, nullable) — Additional context metadata (e.g., retryAfterSecs for rate limits)
- `requestId` (string, optional, nullable) — Unique request identifier for debugging (also in X-Request-Id response header)

### 429 Too Many Requests Error

Rate limit exceeded — retry after the delay in the response

- `code` (enum, required) — Machine-readable error code for programmatic handling
  - Allowed values: `invalid_credentials`, `email_already_exists`, `phone_already_exists`, `contact_phone_already_exists`, `account_suspended`, `account_access_denied`, `token_expired`, `token_invalid`, `token_missing`, `account_header_missing`, `refresh_token_invalid`, `email_already_verified`, `email_verification_code_invalid`, `email_verification_code_expired`, `email_verification_code_used`, `email_service_unavailable`, `phone_already_verified`, `phone_verification_code_invalid`, `phone_verification_code_expired`, `phone_verification_code_used`, `phone_number_missing`, `sms_service_unavailable`, `mfa_already_enabled`, `mfa_not_enabled`, `mfa_not_setup`, `mfa_code_invalid`, `password_reset_token_invalid`, `password_reset_token_expired`, `password_reset_token_used`, `password_current_incorrect`, `password_same_as_current`, `invalid_o_auth_state`, `o_auth_provider_error`, `o_auth_already_linked`, `provider_already_connected`, `o_auth_not_linked`, `cannot_unlink_only_auth`, `validation_failed`, `bad_request`, `invalid_json`, `resource_not_found`, `not_found`, `forbidden`, `insufficient_permissions`, `conflict`, `resource_already_exists`, `insufficient_balance`, `payment_required`, `subscription_required`, `feature_not_available`, `payment_failed`, `business_rule_violation`, `invalid_state_transition`, `unprocessable_entity`, `rate_limit_exceeded`, `queue_full`, `assistant_quota_exceeded`, `user_phone_not_verified`, `account_not_verified`, `payment_method_required`, `trial_already_claimed`, `promotion_not_eligible`, `coupon_not_found`, `coupon_not_redeemable`, `coupon_already_redeemed`, `phone_number_not_active`, `phone_number_not_verified`, `phone_number_cannot_initiate_calls`, `flow_not_published`, `provider_call_rejected`, `concurrent_call_limit_exceeded`, `daily_call_limit_exceeded`, `contact_on_dnc_list`, `outside_callable_hours`, `call_already_completed`, `phone_provider_not_active`, `phone_number_already_connected`, `phone_number_not_connected`, `provider_must_be_sip`, `verification_only_for_sip`, `phone_verification_not_started`, `twilio_credentials_required`, `byoc_only`, `phone_already_registered`, `cannot_delete_system_provider`, `flow_name_already_exists`, `flow_structure_invalid`, `flow_has_connected_phones`, `flow_version_invalid`, `flow_version_conflict`, `flow_function_name_exists`, `flow_function_not_found`, `flow_generation_failed`, `payment_method_card_only`, `template_variable_resolution_failed`, `phone_number_in_use`, `mfa_token_invalid`, `invalid_id_format`, `verification_code_invalid`, `cannot_delete_has_dependencies`, `in_use`, `unsupported_kind`, `offer_taken`, `offer_taken_self`, `offer_expired`, `already_taken`, `takeover_unsupported`, `schedule_not_found`, `schedule_already_paused`, `schedule_not_paused`, `invalid_cron_expression`, `invalid_timezone`, `campaign_not_found`, `campaign_not_draft`, `campaign_no_contacts`, `legal_acceptance_required`, `invitation_not_found`, `invitation_not_pending`, `invitation_expired`, `not_invitation_recipient`, `organization_suspended`, `already_organization_member`, `api_key_invalid`, `api_key_expired`, `api_key_revoked`, `api_key_not_allowed`, `api_key_insufficient_scope`, `api_key_ip_restricted`, `api_key_limit_reached`, `internal_error`, `service_error`, `service_unavailable`, `no_bots_available`, `region_saturated`, `recording_not_available`, `recording_service_not_configured`, `meta_not_configured`, `meta_page_already_connected`, `meta_form_already_mapped`, `meta_api_error`, `meta_lead_unrecoverable`, `unauthorized`
- `detail` (string, required) — Human-readable detail message for this specific error instance
- `status` (integer, required) — HTTP status code (mirrors the response status line)
- `title` (string, required) — Human-readable title for the error category
- `errors` (list of FieldError, optional, nullable) — Field-level validation errors, present when code is `validation_failed`
- `meta` (ErrorResponseMeta, optional, nullable) — Additional context metadata (e.g., retryAfterSecs for rate limits)
- `requestId` (string, optional, nullable) — Unique request identifier for debugging (also in X-Request-Id response header)

### 500 Internal Server Error

Internal server error — contact support with the requestId

- `code` (enum, required) — Machine-readable error code for programmatic handling
  - Allowed values: `invalid_credentials`, `email_already_exists`, `phone_already_exists`, `contact_phone_already_exists`, `account_suspended`, `account_access_denied`, `token_expired`, `token_invalid`, `token_missing`, `account_header_missing`, `refresh_token_invalid`, `email_already_verified`, `email_verification_code_invalid`, `email_verification_code_expired`, `email_verification_code_used`, `email_service_unavailable`, `phone_already_verified`, `phone_verification_code_invalid`, `phone_verification_code_expired`, `phone_verification_code_used`, `phone_number_missing`, `sms_service_unavailable`, `mfa_already_enabled`, `mfa_not_enabled`, `mfa_not_setup`, `mfa_code_invalid`, `password_reset_token_invalid`, `password_reset_token_expired`, `password_reset_token_used`, `password_current_incorrect`, `password_same_as_current`, `invalid_o_auth_state`, `o_auth_provider_error`, `o_auth_already_linked`, `provider_already_connected`, `o_auth_not_linked`, `cannot_unlink_only_auth`, `validation_failed`, `bad_request`, `invalid_json`, `resource_not_found`, `not_found`, `forbidden`, `insufficient_permissions`, `conflict`, `resource_already_exists`, `insufficient_balance`, `payment_required`, `subscription_required`, `feature_not_available`, `payment_failed`, `business_rule_violation`, `invalid_state_transition`, `unprocessable_entity`, `rate_limit_exceeded`, `queue_full`, `assistant_quota_exceeded`, `user_phone_not_verified`, `account_not_verified`, `payment_method_required`, `trial_already_claimed`, `promotion_not_eligible`, `coupon_not_found`, `coupon_not_redeemable`, `coupon_already_redeemed`, `phone_number_not_active`, `phone_number_not_verified`, `phone_number_cannot_initiate_calls`, `flow_not_published`, `provider_call_rejected`, `concurrent_call_limit_exceeded`, `daily_call_limit_exceeded`, `contact_on_dnc_list`, `outside_callable_hours`, `call_already_completed`, `phone_provider_not_active`, `phone_number_already_connected`, `phone_number_not_connected`, `provider_must_be_sip`, `verification_only_for_sip`, `phone_verification_not_started`, `twilio_credentials_required`, `byoc_only`, `phone_already_registered`, `cannot_delete_system_provider`, `flow_name_already_exists`, `flow_structure_invalid`, `flow_has_connected_phones`, `flow_version_invalid`, `flow_version_conflict`, `flow_function_name_exists`, `flow_function_not_found`, `flow_generation_failed`, `payment_method_card_only`, `template_variable_resolution_failed`, `phone_number_in_use`, `mfa_token_invalid`, `invalid_id_format`, `verification_code_invalid`, `cannot_delete_has_dependencies`, `in_use`, `unsupported_kind`, `offer_taken`, `offer_taken_self`, `offer_expired`, `already_taken`, `takeover_unsupported`, `schedule_not_found`, `schedule_already_paused`, `schedule_not_paused`, `invalid_cron_expression`, `invalid_timezone`, `campaign_not_found`, `campaign_not_draft`, `campaign_no_contacts`, `legal_acceptance_required`, `invitation_not_found`, `invitation_not_pending`, `invitation_expired`, `not_invitation_recipient`, `organization_suspended`, `already_organization_member`, `api_key_invalid`, `api_key_expired`, `api_key_revoked`, `api_key_not_allowed`, `api_key_insufficient_scope`, `api_key_ip_restricted`, `api_key_limit_reached`, `internal_error`, `service_error`, `service_unavailable`, `no_bots_available`, `region_saturated`, `recording_not_available`, `recording_service_not_configured`, `meta_not_configured`, `meta_page_already_connected`, `meta_form_already_mapped`, `meta_api_error`, `meta_lead_unrecoverable`, `unauthorized`
- `detail` (string, required) — Human-readable detail message for this specific error instance
- `status` (integer, required) — HTTP status code (mirrors the response status line)
- `title` (string, required) — Human-readable title for the error category
- `errors` (list of FieldError, optional, nullable) — Field-level validation errors, present when code is `validation_failed`
- `meta` (ErrorResponseMeta, optional, nullable) — Additional context metadata (e.g., retryAfterSecs for rate limits)
- `requestId` (string, optional, nullable) — Unique request identifier for debugging (also in X-Request-Id response header)

## Types

### TransferOfferJoin

WebSocket join: a single-use URL for the call's audio.

- `callId` (string, required) — Call joined
- `expiresAt` (string, required) — The join token must be used before this time
- `joinToken` (string, required) — The single-use join token (already in `joinUrl`)
- `joinUrl` (string, required) — WebSocket URL to join the call; carries the single-use join token

### TransferOfferWebRtcAnswer

WebRTC join: the SDP answer plus the ICE servers to keep using (short-lived TURN credentials).

- `callId` (string, required) — Call joined
- `expiresAt` (string, required) — The TURN credentials stop working after this time
- `iceServers` (list of IceServerEntry, required) — ICE servers for the connection
- `sdpAnswer` (string, required) — SDP answer to apply to your peer connection

### FieldError

Individual field error for validation responses Appears in the `errors[]` array when `code` is `validation_failed` # Example ```json { "field": "email", "code": "invalid_format", "message": "Email format is invalid" } ```

- `code` (string, required) — Specific error code for this field
- `field` (string, required) — The field name that failed validation
- `message` (string, required) — Human-readable error message

### ErrorResponseMeta

Additional context metadata (e.g., retryAfterSecs for rate limits)

### IceServerEntry

ICE server entry for WebRTC NAT traversal

- `urls` (string, required) — STUN or TURN URL
- `credential` (string, optional, nullable) — TURN credential (null for STUN servers)
- `username` (string, optional, nullable) — TURN username (null for STUN servers)

## Examples

**Request**

```json
{}
```

**Response**

```json
{
  "callId": "550e8400-e29b-41d4-a716-446655440000",
  "expiresAt": "2026-01-15T10:30:00Z",
  "joinToken": "string",
  "joinUrl": "wss://relay.example.com/join?token=eyJ..."
}
```

**SDK Code**

```python
import requests

url = "https://api.talkif.ai/api/v1/transfers/offers/offerId/accept"

payload = {}
headers = {
    "Authorization": "Bearer <token>",
    "Content-Type": "application/json"
}

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

print(response.json())
```

```javascript
const url = 'https://api.talkif.ai/api/v1/transfers/offers/offerId/accept';
const options = {
  method: 'POST',
  headers: {Authorization: 'Bearer <token>', 'Content-Type': 'application/json'},
  body: '{}'
};

try {
  const response = await fetch(url, options);
  const data = await response.json();
  console.log(data);
} catch (error) {
  console.error(error);
}
```

```go
package main

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

func main() {

	url := "https://api.talkif.ai/api/v1/transfers/offers/offerId/accept"

	payload := strings.NewReader("{}")

	req, _ := http.NewRequest("POST", 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(res)
	fmt.Println(string(body))

}
```

```ruby
require 'uri'
require 'net/http'

url = URI("https://api.talkif.ai/api/v1/transfers/offers/offerId/accept")

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

request = Net::HTTP::Post.new(url)
request["Authorization"] = 'Bearer <token>'
request["Content-Type"] = 'application/json'
request.body = "{}"

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

```java
import com.mashape.unirest.http.HttpResponse;
import com.mashape.unirest.http.Unirest;

HttpResponse<String> response = Unirest.post("https://api.talkif.ai/api/v1/transfers/offers/offerId/accept")
  .header("Authorization", "Bearer <token>")
  .header("Content-Type", "application/json")
  .body("{}")
  .asString();
```

```php
<?php
require_once('vendor/autoload.php');

$client = new \GuzzleHttp\Client();

$response = $client->request('POST', 'https://api.talkif.ai/api/v1/transfers/offers/offerId/accept', [
  'body' => '{}',
  'headers' => [
    'Authorization' => 'Bearer <token>',
    'Content-Type' => 'application/json',
  ],
]);

echo $response->getBody();
```

```csharp
using RestSharp;

var client = new RestClient("https://api.talkif.ai/api/v1/transfers/offers/offerId/accept");
var request = new RestRequest(Method.POST);
request.AddHeader("Authorization", "Bearer <token>");
request.AddHeader("Content-Type", "application/json");
request.AddParameter("application/json", "{}", ParameterType.RequestBody);
IRestResponse response = client.Execute(request);
```

```swift
import Foundation

let headers = [
  "Authorization": "Bearer <token>",
  "Content-Type": "application/json"
]
let parameters = [] as [String : Any]

let postData = JSONSerialization.data(withJSONObject: parameters, options: [])

let request = NSMutableURLRequest(url: NSURL(string: "https://api.talkif.ai/api/v1/transfers/offers/offerId/accept")! as URL,
                                        cachePolicy: .useProtocolCachePolicy,
                                    timeoutInterval: 10.0)
request.httpMethod = "POST"
request.allHTTPHeaderFields = headers
request.httpBody = postData as Data

let session = URLSession.shared
let dataTask = session.dataTask(with: request as URLRequest, completionHandler: { (data, response, error) -> Void in
  if (error != nil) {
    print(error as Any)
  } else {
    let httpResponse = response as? HTTPURLResponse
    print(httpResponse)
  }
})

dataTask.resume()
```