Can you not see any problem with 6 digit 13 numbers? I know that ATAs can often have their own dial plans so these to go to the PSTN line if the ATA has an FXO port.
There will be a problem calling 13 xx xx voxalot numbers when there is a possibility of a 'normal' PSTN 13 xx xx number. You can't setup dial plans to cater for this.... [Edit: unless you know specifcally which 13 xx xx numbers are meant to go where]
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