VAPI Transfer call Issue

I am transferting to real human when user want to speak to real person during call with assistant.
transfering call works correctly, but if human doesn't respond, it ended the call.
i want come back to assistant if human doesn't respond, and say apologize, and suggest to leave voice mail to human. and send voicemail to human via SMS.
Can we do this within vapi tool? or need n8n or twilio integration?

Thank you very much
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