Channel unavailable means that the number was routing to a dead/unallocated number and when rang it would be "beep beep beep - the number you are calling is unavailable".
Please check the number that you are routing these calls to.
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Channel unavailable means that the number was routing to a dead/unallocated number and when rang it would be "beep beep beep - the number you are calling is unavailable".
Please check the number that you are routing these calls to.