A customer may not be able to call without a country code (e.g. 0212345678) or with 00 in front of the number (e.g. 0031212345678), while he is able to reach the callee when dialing the number in the format [country code][area code][number](e.g. 31212345678) due to normalization rules.
Normalization rules are added on our platform for each specific country individually and allow to make outbound calls without a country code or with 00 in front of the number for companies which have the specific country set as 'Country' in the company settings on the Provider (Reseller) panel.
If there is a demand for normalization in a specific country, please contact our support team.