The agent keeps saying that it cant send the SMS. I have no idea whats happening

Hello @Robosalvy , Can you share the call id , give me a screenshot of the error you are seeing ?

Sure, I'll look for it right now. Give me a second.

I see you are using Telnyx number which is not supported for SMS yet , you can buy a Twilio number and apply for the sms or if you have already a twilio number you can connected using sip trunking

Ok thanks so much

You are welcome.

Description: There is an issue with inbound SMS agent handling in Retell AI where the previous agent session continues even after the agent is removed or reassigned. Steps to Reproduce: Configure an inbound SMS number. Assign an agent (Agent A). Start an SMS conversation. Change the agent (Agent B) or remove the agent. Send another inbound SMS. Expected Behavior: The previous agent session should terminate immediately. The system should either: Use the newly assigned agent, or Stop responding if no agent is assigned. Actual Behavior: The previous agent (Agent A) continues handling messages. Session/context does not reset after agent removal or change. Critical Observation: The issue persists until one of the following actions is performed: Sending an outbound SMS, or Changing the inbound SMS number After either of these actions, the system resets and starts behaving correctly. Impact: Users receive responses from outdated agent configurations. Breaks expected real-time agent switching behavior. Can lead to incorrect or unintended communication. Likely Root Cause (Stronger Hypothesis): Session or conversation state is being cached and not invalidated on agent update/removal. Outbound SMS or number change likely triggers: Session refresh Cache invalidation Rebinding of agent configuration Suggested Fix: Force session invalidation when: Agent assignment is updated Agent is removed Ensure inbound message handling: Always fetches the latest agent configuration Does not rely on stale session cache Environment: Retell AI – SMS (Inbound Flow) Issue reproducible consistently