HowToTroubleshooting

AWS Chime StartBotConversation Service Limit

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I am working on a Amazon Chime application that provides natural language and GenAI features to a legacy phone system. After deploying the app into a new account, I got the following error in my SMA Lambda Handler when trying to invoke the Amazon Lex bot:

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{
  "SchemaVersion": "1.0",
  "Sequence": 2,
  "InvocationEventType": "INVALID_LAMBDA_RESPONSE",
  "CallDetails": { ... },
  "ErrorType": "ActionExecutionThrottled",
  "ErrorMessage": "This account has exceeded the number of bot references allowed by the PSTN Audio service"
}

This error was a surprise because I have deployed similar apps in older accounts, without being throttled.

The Service Quota

After doing some searching, I found this documentation about a new service quota

  • Name: Amazon Chime SDK SIP trunking and voice - StartBotConversation Amazon Lex bots
  • Default: 0
  • Adjustable: Yes
  • Description: The maximum number of Amazon Lex bots you can use with the PSTN Audio StartBotConversation action in the current AWS Region.

I assume this quota is pretty new, because I could not find it in the Service Quota console, or list it using the CLI.

I do not know yet if the quota will limit how many distinct bots I can use, or how many bot sessions. Ping me if you know the answer!

Timeline

I submitted a support case to get the limit increased. I will keep this timeline updated until the issue is resolved.

  • 2024-11-15: Submitted case titled: Need to increase service quote. Option is documented but not available in AWS Console.
  • 2024-11-18: Response from support requesting use case description and what region I expect to use
  • 2024-11-19: Response from support: The request has been forwarded to the service team, expect a response in 7-10 days
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