### Answer --- Yes, you can detect when a call is complete by checking the

disconnection_reason

field on the call object. [(1) ]() Common disconnection reasons that indicate a completed call include: -

user_hangup

– user hung up the call -

agent_hangup

– AI agent hung up the call -

call_transfer

– AI agent transferred the call -

voicemail_reached

– voicemail was reached -

inactivity

– call ended due to silence timeout -

max_duration_reached

– maximum call duration reached You can retrieve this information via the [Get Call API]() or by subscribing to webhooks. For your use case of maintaining a rolling dialer (calling the next person when one call ends) , you'd typically: 1. Subscribe to the

call.ended

webhook event to receive real-time notifications when calls complete 2. Check the

call_status

(e.g.,

ended

,

not_connected

,

error

) and

disconnection_reason

, [(2) ]() 3. Trigger the next outbound call from your backend when you receive the webhook The

call_status

values include

ended

,

not_connected

, and

error

, each paired with specific disconnection reasons. [(1) ]() , [(2) ]()

​ To learn more, see the sources I considered: [[1] Debug call disconnection](https://docs.retellai.com/reliability/debug-call-disconnect) [[2] Update Call](https://docs.retellai.com/api-references/update-call) ​

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

### Answer --- You can add explicit guardrails to your first node's prompt to prevent the agent from interpreting any background audio or IVR remnants as caller information. [(1) ]() Try restructuring your prompt using sectional formatting:

## Identity
You are Emma, a routing assistant for Grammar Electrical.
Your ONLY purpose is to route callers to the correct department.

## Style Guardrails
Be concise: Keep responses under 2 sentences unless explaining complex topics.
Be conversational: Use natural language, contractions, and acknowledge what the caller says.

## Response Guidelines
Do NOT collect, store, or acknowledge any names, personal details, or information from the caller.
Ignore any background noise, fragments, or unclear audio at the start of the call.
Only listen for DTMF tones (1, 2, 3, or 4) or spoken menu choices.

## Task Instructions
Greet the caller and present the menu options:
- Press 1 for a quote request
- Press 2 to book a job
- Press 3 for invoice queries
- Press 4 for anything else

If no valid input is detected, politely repeat the options once.

The key additions are: - Explicitly stating the agent should ignore any background noise or fragments at call start - Instructing it to not collect any names or personal details - Limiting what it listens for to only DTMF tones or spoken menu choices This structured approach with clear guardrails should prevent the agent from misinterpreting "grena" as a caller name.

​ To learn more, see the sources I considered: [[1] Prompt Engineering Guide](https://docs.retellai.com/build/prompt-engineering-guide) ​

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

### Answer --- Retell AI itself doesn't provide a mobile app or native integration that sits directly on your personal mobile phone to intercept declined/missed calls. The call forwarding to an AI agent is typically configured at the telephony/carrier level, not within Retell. Here's how it generally works: *The Setup (Outside Retell) * Your mobile carrier or business phone system needs to be configured to forward calls to the AI agent's phone number when: - The call is declined - The call goes unanswered - The line is busy This is standard call forwarding functionality (often called "conditional call forwarding") that you'd set up through your carrier or PBX system. What Retell Handles Once the call is forwarded to a Retell-connected phone number, the AI agent takes over. [(1) ]() Retell supports 24/7 call coverage and can handle overflow calls, after-hours calls, and missed call scenarios. For custom telephony setups, Retell supports SIP trunking where you can configure your telephony provider to route calls to Retell's SIP server. [(2) ]() No Retell Mobile App Required Your customer won't need any apps on their phone. The forwarding happens at the network level before reaching Retell. To implement this, your customer would need to: 1. Set up conditional call forwarding with their carrier to a Retell-connected number 2. Have a Retell agent configured to handle those inbound calls Check out these potentially useful sources for more on telephony setup: [Custom Telephony]() , [Twilio Integration]()

​ To learn more, see the sources I considered: [[1] 2025 B2B Guide to AI Phone Calls & Voice Agents | Retell AI | Retell AI](https://www.retellai.com/blog/b2b-guide-to-ai-phone-calls) [[2] AI Voice Agent + SIP trunk: SIP BYE / end call handling](https://community.retellai.com/t/ai-voice-agent-sip-trunk-sip-bye-end-call-handling/764) ​

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