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Can someone help me understand where is the issue?

Call_ID call_95f7dda72947bcdc16c5486c7aa
https://cdn.discordapp.com/attachments/1470662774878113843/1470662775104733328/image.png?ex=698c1cf1&is=698acb71&hm=f97cd38ff21aa6b7d2302b1ca03b0e76eb30f73d3d3cfa4b9b32c539758ff15b&

The SIP status code 603 (Decline) indicates that the transfer destination declined the call. Verify the transfer destination number is correct and can accept calls

Try using warm transfer instead of cold transfer, which uses SIP DIAL instead of SIP REFER