Hi
My understanding is that the leading single 0 should omitted when dialling Japan, which is the same for many countries e.g. UK, so really, your customers should learn to dial correctly, or you need to tell them.
I'd advise against perpetuating this behaviour, because telecoms is supposed to be standards based.
However, if this is a VoIP call, you could manipulate the number before calling a2billing.php using Asterisk dialplan, If it's a calling card call, then you would need a second set of rates, such as 81096, which calls an A2Billing trunk that removes the 810 prefix and adds 81, This should work, but I've not tested.
Joe
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