### Answer Based on the available sources, I don't have specific documentation about a "Three-Way Ring Tone" setting or troubleshooting beep tones not being heard during warm transfers with VOIP systems like ADIT. [(1) ]() [(2) ]() The warm transfer documentation covers several configuration options including on-hold music, whisper messages, three-way messages, human detection, and agent detection timeout, but doesn't specifically address ring tone beeps or audio signal issues with VOIP destinations. Your issue where the VOIP system might be filtering or "swallowing" the tone before it reaches staff phones could be related to: - SIP signaling or media handling between Retell and your VOIP system [(3) ]() - Audio codec compatibility - VOIP system configuration stripping certain audio tones For warm transfers, you can configure a three-way message (a message spoken to both the transfer target and the original caller once the connection is established) , but this is different from a ring tone beep. [(1) ]() [(2) ]() I'd recommend: 1. Checking your ADIT VOIP system's audio handling settings 2. Verifying SIP trunk configuration between Retell and ADIT [(3) ]() 3. Sharing specific call IDs with Retell support for detailed analysis If you'd like, I can provide general guidance, but for VOIP-specific troubleshooting with your ADIT system, you may need to work directly with Retell support or your VOIP provider.

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

​ To learn more, see the sources I considered: [[1] Call Transfer Node](https://docs.retellai.com/build/conversation-flow/call-transfer-node) [[2] Transfer call](https://docs.retellai.com/build/single-multi-prompt/transfer-call) [[3] Custom Telephony Overview](https://docs.retellai.com/deploy/custom-telephony) ​