--- title: Key points for Procurement and Return of TF/DID Numbers from/to Suppliers description: Key points for Procurement and Return of TF/DID Numbers from/to Suppliers --- [Skip to content](https://support.cinnox.com/migration/internalknowledgebase/tf/did#main-content) English Show submenu for translations CINNOX Open main navigation Close main navigation - English Show submenu for translations - Contact us Contact us How can we help you? - There are no suggestions because the search field is empty. 1. [Help Center](https://support.cinnox.com/migration/internalknowledgebase) 2. [IOD](https://support.cinnox.com/migration/internalknowledgebase/iod) 3. [Procurement](https://support.cinnox.com/migration/internalknowledgebase/iod#procurement) # Key points for Procurement and Return of TF/DID Numbers from/to Suppliers **How many TF/DID numbers should we keep?** IOD should update the last 12 months TF/DID numbers turnover days by destination in monthly basis to keep the numbers of TF/DID numbers in reasonable level.  The active date of each active numbers can be found in Numbers management as follow: ![](https://support.cinnox.com/hubfs/image-png-Jun-01-2022-08-05-40-75-AM.png) The analysis could be done after the export of the report to excel locally.    **Which suppliers should we keep/ procure?** In general, IOD should base on the ASR % to choose which supplier should we consider to keep/ procure for that particular destination. For example, since SMM provides the higher ASR %, IOD should consider SMM as priority for Macao. **![](https://support.cinnox.com/hubfs/image-png-Jun-01-2022-08-16-44-99-AM.png)** For the below case, even PT. Indosat provide lower ASR % than PT. Taztel. However, since PT. Indosat is the tier 1 telecommunication company in Indonesia, IOD should keep/ procure the TF/DID numbers from PT. Indosat rather than PT. Taztel.  ![](https://support.cinnox.com/hubfs/image-png-Jun-01-2022-08-19-18-03-AM.png)   **Points to remember when different rate quoted (fixed, mobile and other rate) by supplier during number procurement** For service plan case, real number with different charge rate should have different routing number. 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