--- title: "Changes to Register A Twilio Call And Return Twiml" method: POST path: "/v1/convai/twilio/register-call" --- # Changes to Register A Twilio Call And Return Twiml `POST /v1/convai/twilio/register-call` > Every recorded change to this operation, newest first. ## Timeline Changed in 25 of 107 revisions. - **2026-10-22** `61de2e1f86c1`: 1 info - **2026-10-15** `4719d4144739`: 1 info - **2026-10-15** `260e07ca1d41`: 2 info - **2026-10-13** `3060999bd80a`: 1 info - **2026-10-11** `775d1f02f1a7`: 1 info - **2026-10-01** `d942e69ff7a7`: 2 info - **2026-09-30** `b3fe16f8d37a`: 5 info - **2026-09-26** `4a6716242c9e`: 1 info - **2026-09-23** `ee57929773bf`: 3 info - **2026-09-23** `cefd6ab6f610`: 2 info - **2026-09-15** `101ef23e3958`: 1 info - **2026-09-09** `0d8d57e64183`: 1 info - **2026-08-25** `311280aae31f`: 1 info - **2026-08-20** `db6eec599cbe`: 1 info - **2026-08-19** `f053c821dc18`: 1 info - **2026-08-15** `acb0175c0525`: 1 info - **2026-08-11** `d1a4847203ce`: 2 info - **2026-08-08** `e77a0a530a82`: 2 info - **2026-08-06** `1cae8adcc965`: 2 info - **2026-08-05** `ebff0190de5c`: 1 info - **2026-07-26** `494d96419d15`: 5 info - **2026-07-13** `009bd651509a`: 3 info - **2026-06-08** `37fac3c5a2d7`: 1 breaking, 10 info - **2026-04-03** `deb5e58ddddf`: 8 info - **2026-02-08** `5b595807512c`: 1 info ## Changes - **2026-10-22** `61de2e1f86c1`: 1 info - added the new optional request property `conversation_initiation_client_data/anyOf[subschema #1: ConversationInitiationClientDataRequest]/start_procedure_ids` - **2026-10-15** `4719d4144739`: 1 info - added the new `nemotron-35-super-vl-nvfp4` enum value to the request property `conversation_initiation_client_data/anyOf[subschema #1: ConversationInitiationClientDataRequest]/conversation_config_override/agent/anyOf[subschema #1: AgentConfigOverride]/prompt/anyOf[subschema #1: PromptAgentAPIModelOverride]/llm/anyOf[subschema #1: LLM]/` - **2026-10-15** `260e07ca1d41`: 2 info - added the new `claude-opus-4-6` enum value to the request property `conversation_initiation_client_data/anyOf[subschema #1: ConversationInitiationClientDataRequest]/conversation_config_override/agent/anyOf[subschema #1: AgentConfigOverride]/prompt/anyOf[subschema #1: PromptAgentAPIModelOverride]/llm/anyOf[subschema #1: LLM]/` - added the new `gemini-4-argon` enum value to the request property `conversation_initiation_client_data/anyOf[subschema #1: ConversationInitiationClientDataRequest]/conversation_config_override/agent/anyOf[subschema #1: AgentConfigOverride]/prompt/anyOf[subschema #1: PromptAgentAPIModelOverride]/llm/anyOf[subschema #1: LLM]/` - **2026-10-13** `3060999bd80a`: 1 info - added the new `claude-haiku-5-5` enum value to the request property `conversation_initiation_client_data/anyOf[subschema #1: ConversationInitiationClientDataRequest]/conversation_config_override/agent/anyOf[subschema #1: AgentConfigOverride]/prompt/anyOf[subschema #1: PromptAgentAPIModelOverride]/llm/anyOf[subschema #1: LLM]/` - **2026-10-11** `775d1f02f1a7`: 1 info - added the new optional request property `conversation_initiation_client_data/anyOf[subschema #1: ConversationInitiationClientDataRequest]/conversation_config_override/agent/anyOf[subschema #1: AgentConfigOverride]/prompt/anyOf[subschema #1: PromptAgentAPIModelOverride]/tool_ids_strict` - **2026-10-01** `d942e69ff7a7`: 2 info - the `` request property default value changed from `eleven_flash_v2` to `eleven_v4_turbo` - added the new `gpt-6.1-sol` enum value to the request property `conversation_initiation_client_data/anyOf[subschema #1: ConversationInitiationClientDataRequest]/conversation_config_override/agent/anyOf[subschema #1: AgentConfigOverride]/prompt/anyOf[subschema #1: PromptAgentAPIModelOverride]/llm/anyOf[subschema #1: LLM]/` - **2026-09-30** `b3fe16f8d37a`: 5 info - added the new `claude-sonnet-5-5` enum value to the request property `conversation_initiation_client_data/anyOf[subschema #1: ConversationInitiationClientDataRequest]/conversation_config_override/agent/anyOf[subschema #1: AgentConfigOverride]/prompt/anyOf[subschema #1: PromptAgentAPIModelOverride]/llm/anyOf[subschema #1: LLM]/` - added the new `eleven_v4` enum value to the request property `conversation_initiation_client_data/anyOf[subschema #1: ConversationInitiationClientDataRequest]/conversation_config_override/tts/anyOf[subschema #1: TTSConversationalConfigOverride]/model_id/anyOf[subschema #1: TTSConversationalModel]/` - added the new `eleven_v4_turbo` enum value to the request property `conversation_initiation_client_data/anyOf[subschema #1: ConversationInitiationClientDataRequest]/conversation_config_override/tts/anyOf[subschema #1: TTSConversationalConfigOverride]/model_id/anyOf[subschema #1: TTSConversationalModel]/` - added the new `v4` enum value to the request property `conversation_initiation_client_data/anyOf[subschema #1: ConversationInitiationClientDataRequest]/conversation_config_override/tts/anyOf[subschema #1: TTSConversationalConfigOverride]/supported_voices/anyOf[subschema #1]/items/model_family/anyOf[subschema #1: TTSModelFamily]/` - added the new `v4_turbo` enum value to the request property `conversation_initiation_client_data/anyOf[subschema #1: ConversationInitiationClientDataRequest]/conversation_config_override/tts/anyOf[subschema #1: TTSConversationalConfigOverride]/supported_voices/anyOf[subschema #1]/items/model_family/anyOf[subschema #1: TTSModelFamily]/` - **2026-09-26** `4a6716242c9e`: 1 info - added the new `deepseek-v41-flash` enum value to the request property `conversation_initiation_client_data/anyOf[subschema #1: ConversationInitiationClientDataRequest]/conversation_config_override/agent/anyOf[subschema #1: AgentConfigOverride]/prompt/anyOf[subschema #1: PromptAgentAPIModelOverride]/llm/anyOf[subschema #1: LLM]/` - **2026-09-23** `ee57929773bf`: 3 info - added the new `glm-52` enum value to the request property `conversation_initiation_client_data/anyOf[subschema #1: ConversationInitiationClientDataRequest]/conversation_config_override/agent/anyOf[subschema #1: AgentConfigOverride]/prompt/anyOf[subschema #1: PromptAgentAPIModelOverride]/llm/anyOf[subschema #1: LLM]/` - added the new `gpt-6-luna` enum value to the request property `conversation_initiation_client_data/anyOf[subschema #1: ConversationInitiationClientDataRequest]/conversation_config_override/agent/anyOf[subschema #1: AgentConfigOverride]/prompt/anyOf[subschema #1: PromptAgentAPIModelOverride]/llm/anyOf[subschema #1: LLM]/` - added the new `gpt-6-sol` enum value to the request property `conversation_initiation_client_data/anyOf[subschema #1: ConversationInitiationClientDataRequest]/conversation_config_override/agent/anyOf[subschema #1: AgentConfigOverride]/prompt/anyOf[subschema #1: PromptAgentAPIModelOverride]/llm/anyOf[subschema #1: LLM]/` - **2026-09-23** `cefd6ab6f610`: 2 info - added the new `claude-opus-5` enum value to the request property `conversation_initiation_client_data/anyOf[subschema #1: ConversationInitiationClientDataRequest]/conversation_config_override/agent/anyOf[subschema #1: AgentConfigOverride]/prompt/anyOf[subschema #1: PromptAgentAPIModelOverride]/llm/anyOf[subschema #1: LLM]/` - added the new `claude-opus-5-5` enum value to the request property `conversation_initiation_client_data/anyOf[subschema #1: ConversationInitiationClientDataRequest]/conversation_config_override/agent/anyOf[subschema #1: AgentConfigOverride]/prompt/anyOf[subschema #1: PromptAgentAPIModelOverride]/llm/anyOf[subschema #1: LLM]/` - **2026-09-15** `101ef23e3958`: 1 info - added the new `gpt-6-astra` enum value to the request property `conversation_initiation_client_data/anyOf[subschema #1: ConversationInitiationClientDataRequest]/conversation_config_override/agent/anyOf[subschema #1: AgentConfigOverride]/prompt/anyOf[subschema #1: PromptAgentAPIModelOverride]/llm/anyOf[subschema #1: LLM]/` - **2026-09-09** `0d8d57e64183`: 1 info - added the new `gemini-3.8-flash` enum value to the request property `conversation_initiation_client_data/anyOf[subschema #1: ConversationInitiationClientDataRequest]/conversation_config_override/agent/anyOf[subschema #1: AgentConfigOverride]/prompt/anyOf[subschema #1: PromptAgentAPIModelOverride]/llm/anyOf[subschema #1: LLM]/` - **2026-08-25** `311280aae31f`: 1 info - added the new optional request property `conversation_initiation_client_data/anyOf[subschema #1: ConversationInitiationClientDataRequest]/conversation_config_override/tts/anyOf[subschema #1: TTSConversationalConfigOverride]/supported_voices` - **2026-08-20** `db6eec599cbe`: 1 info - added the new optional request property `conversation_initiation_client_data/anyOf[subschema #1: ConversationInitiationClientDataRequest]/conversation_config_override/turn/anyOf[subschema #1: TurnConfigOverride]/soft_timeout_config/anyOf[subschema #1: SoftTimeoutConfigOverride]/additional_soft_timeout_messages` - **2026-08-19** `f053c821dc18`: 1 info - added the new optional request property `conversation_initiation_client_data/anyOf[subschema #1: ConversationInitiationClientDataRequest]/procedure_ids` - **2026-08-15** `acb0175c0525`: 1 info - added the new `gemini-3.7-flash` enum value to the request property `conversation_initiation_client_data/anyOf[subschema #1: ConversationInitiationClientDataRequest]/conversation_config_override/agent/anyOf[subschema #1: AgentConfigOverride]/prompt/anyOf[subschema #1: PromptAgentAPIModelOverride]/llm/anyOf[subschema #1: LLM]/` - **2026-08-11** `d1a4847203ce`: 2 info - added the new `avaya` enum value to the request property `conversation_initiation_client_data/anyOf[subschema #1: ConversationInitiationClientDataRequest]/source_info/source/anyOf[subschema #1: ConversationInitiationSource]/` - added the new `gemini-3.6-flash` enum value to the request property `conversation_initiation_client_data/anyOf[subschema #1: ConversationInitiationClientDataRequest]/conversation_config_override/agent/anyOf[subschema #1: AgentConfigOverride]/prompt/anyOf[subschema #1: PromptAgentAPIModelOverride]/llm/anyOf[subschema #1: LLM]/` - **2026-08-08** `e77a0a530a82`: 2 info - added the new optional request property `conversation_initiation_client_data/anyOf[subschema #1: ConversationInitiationClientDataRequest]/conversation_config_override/conversation/anyOf[subschema #1: ConversationConfigOverride]/max_duration_seconds` - added the new optional request property `conversation_initiation_client_data/anyOf[subschema #1: ConversationInitiationClientDataRequest]/conversation_config_override/tts/anyOf[subschema #1: TTSConversationalConfigOverride]/pronunciation_dictionary_locators` - **2026-08-06** `1cae8adcc965`: 2 info - the `` request property default value `gemini-2.5-flash` was removed - added the new `audiocodes` enum value to the request property `conversation_initiation_client_data/anyOf[subschema #1: ConversationInitiationClientDataRequest]/source_info/source/anyOf[subschema #1: ConversationInitiationSource]/` - **2026-08-05** `ebff0190de5c`: 1 info - added the new `gemini-3.5-flash-lite` enum value to the request property `conversation_initiation_client_data/anyOf[subschema #1: ConversationInitiationClientDataRequest]/conversation_config_override/agent/anyOf[subschema #1: AgentConfigOverride]/prompt/anyOf[subschema #1: PromptAgentAPIModelOverride]/llm/anyOf[subschema #1: LLM]/` - **2026-07-26** `494d96419d15`: 5 info - added the new `claude-opus-4-8` enum value to the request property `conversation_initiation_client_data/anyOf[subschema #1: ConversationInitiationClientDataRequest]/conversation_config_override/agent/anyOf[subschema #1: AgentConfigOverride]/prompt/anyOf[subschema #1: PromptAgentAPIModelOverride]/llm/anyOf[subschema #1: LLM]/` - added the new `claude-sonnet-5` enum value to the request property `conversation_initiation_client_data/anyOf[subschema #1: ConversationInitiationClientDataRequest]/conversation_config_override/agent/anyOf[subschema #1: AgentConfigOverride]/prompt/anyOf[subschema #1: PromptAgentAPIModelOverride]/llm/anyOf[subschema #1: LLM]/` - added the new `gpt-5.6-luna` enum value to the request property `conversation_initiation_client_data/anyOf[subschema #1: ConversationInitiationClientDataRequest]/conversation_config_override/agent/anyOf[subschema #1: AgentConfigOverride]/prompt/anyOf[subschema #1: PromptAgentAPIModelOverride]/llm/anyOf[subschema #1: LLM]/` - added the new `gpt-5.6-sol` enum value to the request property `conversation_initiation_client_data/anyOf[subschema #1: ConversationInitiationClientDataRequest]/conversation_config_override/agent/anyOf[subschema #1: AgentConfigOverride]/prompt/anyOf[subschema #1: PromptAgentAPIModelOverride]/llm/anyOf[subschema #1: LLM]/` - added the new `gpt-5.6-terra` enum value to the request property `conversation_initiation_client_data/anyOf[subschema #1: ConversationInitiationClientDataRequest]/conversation_config_override/agent/anyOf[subschema #1: AgentConfigOverride]/prompt/anyOf[subschema #1: PromptAgentAPIModelOverride]/llm/anyOf[subschema #1: LLM]/` - **2026-07-13** `009bd651509a`: 3 info - added the new optional request property `conversation_initiation_client_data/anyOf[subschema #1: ConversationInitiationClientDataRequest]/conversation_config_override/tts/anyOf[subschema #1: TTSConversationalConfigOverride]/model_id` - added the new `salesforce_integration` enum value to the request property `conversation_initiation_client_data/anyOf[subschema #1: ConversationInitiationClientDataRequest]/source_info/source/anyOf[subschema #1: ConversationInitiationSource]/` - added the new `subagent_tool` enum value to the request property `conversation_initiation_client_data/anyOf[subschema #1: ConversationInitiationClientDataRequest]/source_info/source/anyOf[subschema #1: ConversationInitiationSource]/` - **2026-06-08** `37fac3c5a2d7`: 1 breaking, 10 info - removed `#/components/schemas/PromptAgentAPIModelOverride` from the `conversation_initiation_client_data/anyOf[subschema #1: ConversationInitiationClientDataRequest]/conversation_config_override/agent/anyOf[subschema #1: AgentConfigOverride]/prompt` request property `anyOf` list - added the new optional request property `conversation_initiation_client_data/anyOf[subschema #1: ConversationInitiationClientDataRequest]/conversation_config_override/asr` - added the new optional request property `conversation_initiation_client_data/anyOf[subschema #1: ConversationInitiationClientDataRequest]/starting_workflow_node_id` - added `#/components/schemas/PromptAgentAPIModelOverride-Input` to the `conversation_initiation_client_data/anyOf[subschema #1: ConversationInitiationClientDataRequest]/conversation_config_override/agent/anyOf[subschema #1: AgentConfigOverride]/prompt` request property `anyOf` list - added the new `exotel` enum value to the request property `conversation_initiation_client_data/anyOf[subschema #1: ConversationInitiationClientDataRequest]/source_info/source/anyOf[subschema #1: ConversationInitiationSource]/` - added the new `freshdesk_integration` enum value to the request property `conversation_initiation_client_data/anyOf[subschema #1: ConversationInitiationClientDataRequest]/source_info/source/anyOf[subschema #1: ConversationInitiationSource]/` - added the new `genesys_bot_connector` enum value to the request property `conversation_initiation_client_data/anyOf[subschema #1: ConversationInitiationClientDataRequest]/source_info/source/anyOf[subschema #1: ConversationInitiationSource]/` - added the new `intercom_integration` enum value to the request property `conversation_initiation_client_data/anyOf[subschema #1: ConversationInitiationClientDataRequest]/source_info/source/anyOf[subschema #1: ConversationInitiationSource]/` - added the new `telegram_integration` enum value to the request property `conversation_initiation_client_data/anyOf[subschema #1: ConversationInitiationClientDataRequest]/source_info/source/anyOf[subschema #1: ConversationInitiationSource]/` - added the new `twilio_sms` enum value to the request property `conversation_initiation_client_data/anyOf[subschema #1: ConversationInitiationClientDataRequest]/source_info/source/anyOf[subschema #1: ConversationInitiationSource]/` - request property `conversation_initiation_client_data/anyOf[subschema #1: ConversationInitiationClientDataRequest]/dynamic_variables/additionalProperties/` list-of-types was widened by adding types `array` to media type `application/json` - **2026-04-03** `deb5e58ddddf`: 8 info - added the new optional request property `conversation_initiation_client_data/anyOf[subschema #1: ConversationInitiationClientDataRequest]/branch_id` - added the new optional request property `conversation_initiation_client_data/anyOf[subschema #1: ConversationInitiationClientDataRequest]/conversation_config_override/agent/anyOf[subschema #1: AgentConfigOverride]/max_conversation_duration_message` - added the new optional request property `conversation_initiation_client_data/anyOf[subschema #1: ConversationInitiationClientDataRequest]/environment` - the `` request property default value `gemini-2.5-flash` was added - the `` request property default value `unknown` was added - added the new `claude-sonnet-4-6` enum value to the request property `conversation_initiation_client_data/anyOf[subschema #1: ConversationInitiationClientDataRequest]/conversation_config_override/agent/anyOf[subschema #1: AgentConfigOverride]/prompt/anyOf[subschema #1: PromptAgentAPIModelOverride]/llm/anyOf[subschema #1: LLM]/` - added the new `gemini-3.1-flash-lite-preview` enum value to the request property `conversation_initiation_client_data/anyOf[subschema #1: ConversationInitiationClientDataRequest]/conversation_config_override/agent/anyOf[subschema #1: AgentConfigOverride]/prompt/anyOf[subschema #1: PromptAgentAPIModelOverride]/llm/anyOf[subschema #1: LLM]/` - added the new `template_preview` enum value to the request property `conversation_initiation_client_data/anyOf[subschema #1: ConversationInitiationClientDataRequest]/source_info/source/anyOf[subschema #1: ConversationInitiationSource]/` - **2026-02-08** `5b595807512c`: 1 info - endpoint added --- [Operation](https://skmtc.dev/elevenlabs/apis/elevenlabs-api-documentation/docs/v1/convai/twilio/register-call/post.md) - [API](https://skmtc.dev/elevenlabs/apis/elevenlabs-api-documentation.md) - [Page](https://skmtc.dev/elevenlabs/apis/elevenlabs-api-documentation/changes/v1/convai/twilio/register-call/post)