UK Platform: End Call Reason Destination: Error (503 or Fast Busy) - Invoca

This end of call reason usually means the destination carrier rejected the call due to their own settings.

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Applies to

UK calls
Destination error
Call routing issues
Anonymous Caller ID

Answer

If a call’s End of Call Reason shows Destination: Error (503 or Fast Busy), the call is being rejected at the destination carrier — usually due to settings on the carrier’s end, not your Invoca configuration.

Last modified on September 30, 2026