Use the Telephone sub-element of the AccountingCustomerParty element to model this information.

Elements

Element	Description
`Invoice/AccountingCustomerParty/Contact/Name`	Specify the contact's name.
`Invoice/AccountingCustomerParty/Contact/Telephone`	Specify the phone number. This is required.
`Invoice/AccountingCustomerparty/Contact/ElectronicMail`	Specify the contact's email.

Example

<ubl:Invoice>
    <!-- Code omitted for clarity -->
        <cac:AccountingSupplierParty>
            <cac:Party>
                <!-- Code omitted for clarity -->
                <cac:Contact>
                    <cbc:Name>customer service</cbc:Name>
                    <cbc:Telephone>+60-123456789</cbc:Telephone>
                    <cbc:ElectronicMail>[email protected]</cbc:ElectronicMail>
                </cac:Contact>
                <!-- Code omitted for clarity -->
            </cac:Party>
        </cac:AccountingSupplierParty>
    <!-- Code omitted for clarity -->
</ubl:Invoice>