Here is the log from that call id you provided:
{ "name": "transferCall", "role": "tool_call_result", "time": 1747559617810, "result": "Success.", "toolCallId": "1747559616184-ey5ikup1t", "secondsFromStart": 11.153 }
The transfer destination was {\\"destination\\": \\"+353xxxxx321\\"}" and the call-ended-reason is "endedReason": "assistant-forwarded-call", suggesting that the call forwarded, but possibly the other phone was not set up correctly or was the incorrect number. Please confirm some of these details and let us know how we can help.