BILLING VERIFICATION INFORMATION. 4.1 SingTel shall use its reasonable endeavours to provide Billing Verification Information for the Emergency Call Service in accordance with the format set out in Annex 4A-2 within fourteen (14) Calendar Days from the end of each Billing Period, together with the invoice for the Emergency Services to be issued in accordance with Schedule 9. 4.2 In addition to the obligation in clause 4.1, when there is a dispute in relation to invoices issued for the Emergency Services, the Parties shall exchange the Detailed Billing Verification Information set out in Annex 4A-3. 4.3 In the event that SingTel cannot record Billing Verification Information for the Emergency Call Service due to a system error or other fault, upon the request of SingTel, the Requesting Licensee shall provide Billing Verification Information to SingTel. 4.4 Where the Billing Verification Information collected by the Requesting Licensee is not available under clause 4.3, the Parties shall negotiate in good faith such alternative Billing arrangements, such as an estimation based on the previous three (3) months' Billing Verification Information, that are appropriate in the circumstances.
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Sources: Emergency Call Service Agreement, Emergency Call Service Agreement