We observed intermittent failures when transferring calls from Amazon Connect to the external number
Observed behavior during failure scenarios:
• Call rings for a few seconds.
• Call then disconnects without connecting to the destination.
• No error is returned to the caller within Amazon Connect. Only shows "Third Party disconnect" in Contact search
Key Findings
• The issue occurs intermittently, not consistently.
• The team managing the destination number confirmed that no SIP INVITE is received during the failed call attempts.
• When calls originate outside Singapore (e.g., Australia or India) or a very small number of Singapore mobile numbers and are routed via Amazon Connect to the transfer works consistently.
