### Answer For warm transfers that require both extension (EXT) navigation and IVR navigation, you can configure both capabilities within the transfer call settings [(1) ]() . Extension Configuration: You can set the transfer number extension directly in the transfer call tool settings. Extensions must be 0-9, '*', '#' (e.g., 123#) . IVR Navigation Configuration: For warm transfers specifically, you can configure IVR navigation through the "Navigate IVR" setting. You provide a prompt to help the agent navigate if the transfer target is an IVR system . How They Work Together: The extension field handles direct extension dialing, while the Navigate IVR prompt guides the AI agent through interactive voice response menus using the press digit functionality [(1) ]() [(2) ]() . The Navigate IVR prompt should include clear instructions on when and what digits to press, similar to the guidance in the Press Digit documentation [(2) ]() . You can specify preferred navigation keywords, keywords to avoid, and guidance for uncertain situations . Both settings can be configured simultaneously in your warm transfer configuration, allowing the agent to handle extension dialing first, then navigate any subsequent IVR menus it encounters [(1) ]() .

​ To learn more, see the sources I considered: [[1] Transfer call](https://docs.retellai.com/build/single-multi-prompt/transfer-call) [[2] Press digit (IVR navigation)](https://docs.retellai.com/build/single-multi-prompt/press-digit) ​

Feel free to tag @AI Evy with additional questions. I also appreciate feedback, it helps me improve.

### Answer For dynamic extension selection based on call context, you can use dynamic variables in the extension field [(1) ]() [(2) ]() . Dynamic variables allow you to inject personalized data that gets substituted at runtime [(3) ]() . Extension Configuration: Set the transfer number extension to a dynamic variable like

{{selected_extension}}

instead of a static value [(1) ]() [(2) ]() . The extension must be 0-9, '*', '#' (e.g., 123#) . Dynamic Variable Setup: You can set dynamic variables through: - Agent-level default dynamic variables as fallback values [(3) ]() - Runtime substitution when initiating calls via API in the

retell_llm_dynamic_variables

object - Inbound Call Webhook for incoming calls IVR Navigation Configuration: For context-based IVR navigation during warm transfers, configure the "Navigate IVR" setting with a prompt that instructs the agent how to navigate the IVR system [(1) ]() [(2) ]() . The prompt should guide the AI on when and what digits to press based on the call context . Combined Setup: In your warm transfer configuration: 1. Set extension field to

{{selected_extension}}

or similar dynamic variable 2. Provide a Navigate IVR prompt that includes conditional logic based on your call context (e.g., "If the caller needs billing support, press 2. If they need technical support, press 3.") The agent will first dial the

dynamically determined extension, then use the Navigate IVR instructions to handle any subsequent menu navigation based on the call context .

​ To learn more, see the sources I considered: [[1] Transfer call](https://docs.retellai.com/build/single-multi-prompt/transfer-call) [[2] Call Transfer Node](https://docs.retellai.com/build/conversation-flow/call-transfer-node) [[3] Dynamic Variables](https://docs.retellai.com/build/dynamic-variables) ​

Feel free to tag @AI Evy with additional questions. I also appreciate feedback, it helps me improve.

Thanks for the follow-up, @Rakshit Kalra. I'll get back to you soon.

ly supported at that time . For your use case of dynamic extension selection followed by IVR navigation, you may need to test whether the Navigate IVR prompt can handle the complete sequence, or if you need to use the extension field for the initial extension and Navigate IVR for subsequent menu navigation [(1) ]() [(2) ]() .

​ To learn more, see the sources I considered: [[1] Transfer call](https://docs.retellai.com/build/single-multi-prompt/transfer-call) [[2] Call Transfer Node](https://docs.retellai.com/build/conversation-flow/call-transfer-node) [[3] Press digit (IVR navigation)](https://docs.retellai.com/build/single-multi-prompt/press-digit) [[4] Press Digit Node](https://docs.retellai.com/build/conversation-flow/press-digit-node) [[5] IVR navigation assistance](https://discord.com/channels/1186424376300679209/1311341427665534998) ​

Feel free to tag @AI Evy with additional questions. I also appreciate feedback, it helps me improve.