Deprecating on 01/23/2026

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Cold Transfer Mode Selection

• Create Retell LLM
• Update Retell LLM
• Create Conversation Flow
• Update Conversation Flow
• Create Conversation Flow Component
• Update Conversation Flow Component

• The show_transferee_as_caller parameter will no longer control the transfer mode (SIP REFER vs SIP INVITE).
• Use the new cold_transfer_mode parameter to explicitly choose between sip_refer and sip_invite.
• The show_transferee_as_caller parameter will only control caller ID display and will only take effect when cold_transfer_mode is set to sip_invite.

• Set cold_transfer_mode to sip_refer or sip_invite to choose the transfer method.
• Set show_transferee_as_caller to true only if you want to show the transferee as the caller when using sip_invite mode.