Based on the situation that you described, it looks like a misconfiguration on the agent flow more than an integration issue. The “Small talk chatbot” that you referred to, is the “Test Agent” tab from the top-right corner? If not, the same situation happens with the Test Agent?
Since it is a voice interaction, check also the “sys.no-match-default” event, because it may detect some word from the background or some similar situations.
The first point that you mention, related to the trigger of the “Default Welcome Intent” when there is no input message, is this an expected situation?
About the “promptly ends the phone call immediately after the fulfillment message is over.”, are the agent logs showing any information regarding the end of the call? Also, when you try your bot without telephony integration, it is also ending? Or it only happens when you are on call with your bot?
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