On first look this rule is odd:
{>(<1:>1xxxxxxxxxx):sp3}
To send 1xxxxxxxxxx to sp3 you would need to dial 11xxxxxxxxxx. This may be what you intend. Otherwise, the much simpler rule:
{>(1xxxxxxxxxx):sp3}
would seem to be the correct format.
A general security point is worth making here. Using single-stage "through dialling" as you are here, I feel more comfortable including CallerID as part of the rule:
{(Mcot)>(<1:>1xxxxxxxxxx):sp3},{(Mcot)>(<3000:xxxxxxx@localphone.com>):sp1},{(Mcot)>(xx.):vg1}
"cot" would be a User Defined Digitmap containing all of the CallerIDs that I want to have permission to "through dial" using my OBi device.
I know that you are an experienced OBi user, so you may have other security measures in place.